Annual report pursuant to Section 13 and 15(d)

Retirement Benefit Plans (Asset Allocation) (Details)

v3.8.0.1
Retirement Benefit Plans (Asset Allocation) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 30, 2016
Feb. 03, 2018
Jan. 28, 2017
Jan. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Actual plan asset allocations   100.00% 100.00%  
Defined benefit plan, investment policies and strategies narrative description   In 2009, we began implementing a liability-driven investment (LDI) strategy to lower the plan’s volatility risk and minimize the impact of interest rate changes on the plan funded status. The implementation of the LDI strategy is phased in over time by reallocating the plan’s assets more towards fixed income investments (i.e., debt securities) that are more closely matched in terms of duration to the plan liability. The plan’s asset portfolio is actively managed and primarily invested in fixed income balanced with investments in equity securities and other asset classes to maintain an efficient risk/return diversification profile. The risk of loss in the plan’s equity portfolio is mitigated by investing in a broad range of equity securities across different sectors and countries. Investment types, including high-yield debt securities, illiquid assets such as real estate, the use of derivatives and Company securities are set forth in written guidelines established for each investment manager and monitored by the plan’s management team. The plan’s asset allocation policy is designed to meet the plan’s future pension benefit obligations. Under the policy, asset classes are periodically reviewed and rebalanced as necessary, to ensure that the mix continues to be appropriate relative to established targets and ranges.    
Defined benefit plan, risk management practices   We have an internal Benefit Plans Investment Committee (BPIC), which consists of senior executives who have established a review process of asset allocation and investment strategies and oversee risk management practices associated with the management of the plan’s assets. Key risk management practices include having an established and broad decision-making framework in place, focused on long-term plan objectives. This framework consists of the BPIC and various third parties, including investment managers, an investment consultant, an actuary and a trustee/custodian. The funded status of the plan is monitored on a continuous basis, including quarterly reviews with updated market and liability information. Actual asset allocations are monitored monthly and rebalancing actions are executed at least quarterly, if needed. To manage the risk associated with an actively managed portfolio, the plan’s management team reviews each manager’s portfolio on a quarterly basis and has written manager guidelines in place, which are adjusted as necessary to ensure appropriate diversification levels. Finally, to minimize operational risk, we utilize a master custodian for all plan assets, and each investment manager reconciles its account with the custodian at least quarterly.    
Equity securities total [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Benefit Plan, Target Allocation Percentage   15% - 35%    
Actual plan asset allocations   23.00% 22.00%  
Fixed income total [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Benefit Plan, Target Allocation Percentage   55% - 70%    
Actual plan asset allocations   62.00% 60.00%  
Real estate, cash and other [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Benefit Plan, Target Allocation Percentage   10% - 20%    
Actual plan asset allocations   15.00% 18.00%  
Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement $ 180 $ (13) $ 0 $ (180)