v2.4.0.6
Pension and Postretirement Health Care Plans (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Jan. 28, 2012
Jan. 29, 2011
Jan. 30, 2010
Change in Plan Assets      
Fair value of plan assets at end of year $ 2,921 $ 2,430  
Recognition of Funded/Unfunded Status      
Other noncurrent liabilities (225) (128)  
Qualified Plans
      
Recognition of Funded/Unfunded Status      
Other noncurrent assets 3 5  
Accrued and other current liabilities (1) (1)  
Other noncurrent liabilities (96) (14)  
Net amounts recognized (94) (10)  
Nonqualified Plans
      
Recognition of Funded/Unfunded Status      
Accrued and other current liabilities (9) (11)  
Other noncurrent liabilities (129) (114)  
Net amounts recognized (138) (125)  
Pension Benefits
      
Change in Projected Benefit Obligation      
Service cost 117 115 100
Interest cost 137 129 125
Amounts in Accumulated Other Comprehensive Income      
Net actuarial loss 1,027 895  
Prior service credits   (1)  
Amounts in accumulated other comprehensive income, total 1,027 894 895
Beginning balance 894 895  
Net actuarial loss 198 40  
Amortization of net actuarial losses (67) (44)  
Amortization of prior service costs and transition 2 3  
Ending balance 1,027 894 895
Beginning balance, net of tax 543 544  
Net actuarial loss, net of tax 120 25  
Amortization of net actuarial losses, net of tax (41) (27)  
Amortization of prior service costs and transition, net of tax 1 1  
Ending balance, net of tax 623 543 544
Pension Benefits | Qualified Plans
      
Change in Projected Benefit Obligation      
Benefit obligation at beginning of year 2,525 2,227  
Service cost 116 114  
Interest cost 135 127  
Actuarial (gain)/loss 349 160  
Participant contributions 1 2  
Benefits paid (111) (105)  
Benefit obligation at end of year 3,015 2,525  
Change in Plan Assets      
Fair value of plan assets at beginning of year 2,515 2,157  
Actual return on plan assets 364 308  
Employer contributions 152 153  
Participant contributions 1 2  
Benefits paid (111) (105)  
Fair value of plan assets at end of year 2,921 2,515  
Funded/(underfunded) status (94) (10)  
Pension Benefits | Nonqualified Plans
      
Change in Projected Benefit Obligation      
Benefit obligation at beginning of year 31 33  
Service cost 1 1  
Interest cost 2 2  
Actuarial (gain)/loss 7 (2)  
Benefits paid (3) (3)  
Benefit obligation at end of year 38 31  
Change in Plan Assets      
Employer contributions 3 3  
Benefits paid (3) (3)  
Funded/(underfunded) status (38) (31)  
Postretirement Health Care Benefits
      
Change in Projected Benefit Obligation      
Benefit obligation at beginning of year 94 87  
Service cost 10 9 7
Interest cost 4 4 6
Actuarial (gain)/loss   3  
Participant contributions 6 6  
Benefits paid (14) (15)  
Benefit obligation at end of year 100 94 87
Change in Plan Assets      
Employer contributions 8 9  
Participant contributions 6 6  
Benefits paid (14) (15)  
Funded/(underfunded) status (100) (94)  
Amounts in Accumulated Other Comprehensive Income      
Net actuarial loss 44 48  
Prior service credits (41) (51)  
Amounts in accumulated other comprehensive income, total 3 (3) (12)
Beginning balance (3) (12)  
Net actuarial loss   3  
Amortization of net actuarial losses (4) (4)  
Amortization of prior service costs and transition 10 10  
Ending balance 3 (3) (12)
Beginning balance, net of tax (2) (7)  
Net actuarial loss, net of tax   2  
Amortization of net actuarial losses, net of tax (2) (3)  
Amortization of prior service costs and transition, net of tax 6 6  
Ending balance, net of tax $ 2 $ (2) $ (7)