Annual report pursuant to Section 13 and 15(d)

Retirement Benefit Plans (Investments at Fair Value) (Details)

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Retirement Benefit Plans (Investments at Fair Value) (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 28, 2017
Jan. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Total investment assets at fair value $ 3,886 $ 3,639
Total investment liabilities at fair value (934)  
Accounts payable, net (76) (158)
Defined Benefit Plans Fair Value Total Investments at NAV 579 [1] (613) [2]
Total net assets $ 3,455 3,287
Plan assets at fair value, description Cash – Cash is valued at cost which approximates fair value, and is classified as level 1 of the fair value hierarchy.   Common Collective Trusts – Common collective trusts are pools of investments within cash equivalents, equity and fixed income that are benchmarked relative to a comparable index. They are valued on the basis of the relative interest of each participating investor in the fair value of the underlying assets. The underlying assets are valued at net asset value (NAV) and are classified as level 2 of the fair value hierarchy.   Equity Securities – Equity securities are common stocks and preferred stocks valued based on the price of the security as listed on an open active exchange and classified as level 1 of the fair value hierarchy, as well as warrants and preferred stock that are valued at a price, which is based on a broker quote in an over-the-counter market, and are classified as level 2 of the fair value hierarchy.   Private Equity – Private equity is composed of interests in private equity funds valued on the basis of the relative interest of each participating investor in the fair value of the underlying assets and/or common stock of privately held companies. There are no observable market values for private equity funds. The valuations for the funds are derived using a combination of different methodologies including (1) the market approach, which consists of analyzing market transactions for comparable assets, (2) the income approach using the discounted cash flow model, or (3) cost method. Private equity funds also provide audited financial statements. Private equity investments are classified as level 3 of the fair value hierarchy. Corporate Bonds – Corporate bonds and Corporate loans are valued at a price which is based on observable market information in primary markets or a broker quote in an over-the-counter market, and are classified as level 2 or level 3 of the fair value hierarchy.    Swaps – swap contracts are based on broker quotes in an over-the-counter market and are classified as level 2 of the fair value hierarchy.   Government, Municipal Bonds and Mortgaged Backed Securities  – Government and municipal securities are valued at a price based on a broker quote in an over-the-counter market and classified as level 2 of the fair value hierarchy. Mortgage backed securities are valued at a price based on observable market information or a broker quote in an over-the-counter market and classified as level 2 of the fair value hierarchy.   Other fixed income – non-mortgage asset backed securities, collateral held in short-term investments for derivative contract and derivatives composed of futures contracts, option contracts and other fix income derivatives valued at a price based on observable market information or a broker quote in an over-the-counter market and classified as level 2 of the fair value hierarchy.       Real Estate – Real estate is comprised of public and private real estate investments. Real estate investments through registered investment companies that trade on an exchange are classified as level 1 of the fair value hierarchy. Investments through open end private real estate funds that are valued at the reported NAV are classified as level 2 of the fair value hierarchy. Private real estate investments through partnership interests that are valued based on different methodologies including discounted cash flow, direct capitalization and market comparable analysis are classified as level 3 of the fair value hierarchy. Hedge Fund – Hedge funds exposure is through fund of funds, which are made up of over 30 different hedge fund managers diversified over different hedge strategies. The fair value of the hedge fund is determined by the fund's administrator using valuation provided by the third party administrator for each of the underlying funds.  
Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value [3] $ 0  
Total investment assets at fair value 573 [3] 401 [4]
Total investment liabilities at fair value 0 [3] 0 [4]
Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Total investment assets at fair value 3,306 [3] 3,230 [4]
Total investment liabilities at fair value (934) [3] (807) [4]
Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0  
Total investment assets at fair value 7 8
Total investment liabilities at fair value 0 0
Common Collective Trusts [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 88 427
Common Collective Trusts [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value [4]   0
Common Collective Trusts [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 88 [3] 427 [4]
Common Collective Trusts [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value   0
Cash and cash equivalents total [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 90 513
Cash and cash equivalents total [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 2 [3] 86 [4]
Cash and cash equivalents total [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 88 [3] 427 [4]
Cash and cash equivalents total [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 0
Cash, benefit plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 2 86
Cash, benefit plan [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 2 [3] 86 [4]
Cash, benefit plan [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 [3] 0 [4]
Cash, benefit plan [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 0
Equity securities total [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 682 447
Equity securities total [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 534 [3] 281 [4]
Equity securities total [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 148 [3] 166 [4]
Equity securities total [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 0
Equity securities held within common collective trusts, international [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 148 166
Equity securities held within common collective trusts, international [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 [3] 0 [4]
Equity securities held within common collective trusts, international [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 148 [3] 166 [4]
Equity securities held within common collective trusts, international [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 0
Equity securities, domestic [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 421 192
Equity securities, domestic [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 421 [3] 192 [4]
Equity securities, domestic [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 [3] 0 [4]
Equity securities, domestic [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 0
Equity securities, international [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 113 89
Equity securities, international [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 113 [3] 89 [4]
Equity securities, international [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 [3] 0 [4]
Equity securities, international [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 0
Fixed income total [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 3,062 2,631
Investment liabilities at fair value (934) (807)
Total investment liabilities at fair value   (807)
Fixed income total [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 [3] 0 [4]
Investment liabilities at fair value 0 [3] 0 [4]
Fixed income total [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 3,055 [3] 2,623 [4]
Investment liabilities at fair value (934) [3] (807) [4]
Fixed income total [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 7 8
Investment liabilities at fair value 0 0
Debt securities held within common collective trusts [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 864 676
Debt securities held within common collective trusts [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 [3] 0 [4]
Debt securities held within common collective trusts [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 864 [3] 676 [4]
Debt securities held within common collective trusts [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 0
Corporate bonds [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 926 776
Corporate bonds [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 [3] 0 [4]
Corporate bonds [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 919 [3] 771 [4]
Corporate bonds [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 7 5
Swaps [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 934 787
Investment liabilities at fair value (928) (801)
Swaps [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 [3] 0 [4]
Investment liabilities at fair value 0 [3] 0 [4]
Swaps [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 934 [3] 787 [4]
Investment liabilities at fair value (928) [3] (801) [4]
Swaps [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 0
Investment liabilities at fair value 0 0
Asset-backed Securities [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 4 4
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 [3] 0 [4]
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 4 [3] 4 [4]
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 0
Government securities [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 185 230
Government securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 [3] 0 [4]
Government securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 185 [3] 230 [4]
Government securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 0
Other fixed income [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 149 158
Investment liabilities at fair value (6) (6)
Other fixed income [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 [3] 0 [4]
Investment liabilities at fair value 0 [3] 0 [4]
Other fixed income [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 149 [3] 155 [4]
Investment liabilities at fair value (6) [3] (6) [4]
Other fixed income [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 3
Investment liabilities at fair value 0 0
Real estate total [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 52 48
Real estate total [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 37 [3] 34 [4]
Real estate total [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 15 [3] 14 [4]
Real estate total [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 0
Public REITs [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 37 34
Public REITs [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 37 [3] 34 [4]
Public REITs [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 [3] 0 [4]
Public REITs [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 0
Private real estate [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 15 14
Private real estate [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 [3] 0 [4]
Private real estate [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 15 [3] 14 [4]
Private real estate [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Investments at fair value 0 0
Investments at NAV Common Collective Trusts [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plans Fair Value Total Investments at NAV (220) [1] (248) [2]
Investments at NAV Private Real Estate [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plans Fair Value Total Investments at NAV 135 [1] 151 [2]
Investments at NAV Hedge Funds [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plans Fair Value Total Investments at NAV $ 224 [1] $ 214 [2]
[1] (2)Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the Consolidated Balance Sheet.
[2] (2)Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the Consolidated Balance Sheet.
[3] (1)There were no significant transfers in or out of level 1 or 2 invest
[4] There were no significant transfers in or out of level 1 or 2 investments.