Retirement Benefit Plans (Accumulated Other Comprehensive (Loss)/Income) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Feb. 02, 2013
Jan. 28, 2012
Primary Plan Benefits [Member]
    
Net loss/(gain) $ 1,679 [1] $ 2,148
Prior service cost/(credit) 42 1
Defined Benefit Plan, Accumulated Other Comprehensive Income, before Tax, Total 1,721 2,149
Defined Benefit Plan, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year 158  
Supplemental Plan Benefits [Member]
    
Net loss/(gain) 185 [1] 163
Prior service cost/(credit) 3 4
Defined Benefit Plan, Accumulated Other Comprehensive Income, before Tax, Total 188 167
Defined Benefit Plan, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year 24  
Other Postretirement Benefit Plans, Defined Benefit [Member]
    
Net loss/(gain) (7) [2] (5)
Prior service cost/(credit) (23) [2] (43)
Defined Benefit Plan, Accumulated Other Comprehensive Income, before Tax, Total (30) (48)
Defined Benefit Plan, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year $ (1) $ (8)
[1] Approximately $158 million for the Primary Pension Plan and $24 million for the supplemental plans are expected to be amortized from accumulated other comprehensive income/loss into net periodic benefit expense/(income) in 2013.
[2] In 2013, approximately $(1) million of net loss/(gain) and $(8) million of prior service cost/(credit) for the postretirement plan are expected to be amortized from accumulated other comprehensive loss into net periodic postretirement benefit (income).