Annual report pursuant to Section 13 and 15(d)

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

v2.4.0.6
Retirement Benefit Plans (Accumulated Other Comprehensive (Loss)/Income) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jan. 28, 2012
Jan. 29, 2011
Net loss/(gain) $ 2,285 $ 1,568
Prior service cost/(credit) (38) (66)
Benefits Plan Primary Plan [Member]
   
Net loss/(gain) 2,148 1,484
Prior service cost/(credit) 1 1
Defined Benefit Plan, Accumulated Other Comprehensive Income, before Tax, Total 2,149 1,485
Defined Benefit Plan, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year 231  
Benefits Supplemental Plan [Member]
   
Net loss/(gain) 163 117
Prior service cost/(credit) 4 1
Defined Benefit Plan, Accumulated Other Comprehensive Income, before Tax, Total 167 118
Defined Benefit Plan, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year 22  
Other Postretirement Benefit Plans, Defined Benefit [Member]
   
Net loss/(gain) (5) (14)
Prior service cost/(credit) (43) (68)
Defined Benefit Plan, Accumulated Other Comprehensive Income, before Tax, Total (48) (82)
Defined Benefit Plan, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year $ (15)