Annual report pursuant to Section 13 and 15(d)

Retirement Benefit Plans (Accumulated Other Comprehensive (Loss)/Income) (Details)

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Retirement Benefit Plans (Accumulated Other Comprehensive (Loss)/Income) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Feb. 01, 2014
Feb. 02, 2013
Jan. 31, 2013
Primary Pension Plan
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net loss/(gain) $ 898 $ 1,679  
Prior service cost/(credit) 53 42  
Defined Benefit Plan, Accumulated Other Comprehensive Income, before Tax, Total 951 1,721  
Defined Benefit Plan, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year 57    
Supplemental Pension Plans
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net loss/(gain) 127 185  
Prior service cost/(credit) (6) 3  
Defined Benefit Plan, Accumulated Other Comprehensive Income, before Tax, Total 121 188  
Defined Benefit Plan, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year 15    
Other Postretirement Benefit Plan, Defined Benefit [Member]
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net loss/(gain) (6)   (7)
Prior service cost/(credit) (15)   (23)
Defined Benefit Plan, Accumulated Other Comprehensive Income, before Tax, Total (21)   (30)
Defined Benefit Plan, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year $ (1) $ (8)