Annual report pursuant to Section 13 and 15(d)

Postretirement Health Care and Life Insurance Benefits (Reconciliation Of Benefit Obligations, Plan Assets, And Funded Status Of The Postretirement Obligations) (Details)

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Postretirement Health Care and Life Insurance Benefits (Reconciliation Of Benefit Obligations, Plan Assets, And Funded Status Of The Postretirement Obligations) (Details) (Postretirement Obligations, USD $)
In Millions, unless otherwise specified
12 Months Ended
Jan. 28, 2012
Jan. 29, 2011
Funded status at end of year $ (266) $ (278)
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities 29  
Accounts payable and accrued liabilities   (30)
Other liabilities (237) (248)
Net actuarial (gain) loss (23) (25)
Change in projected benefit obligation [Member]
   
Projected benefit obligation, beginning of year 278 278
Service cost 0 0
Interest cost 14 15
Actuarial loss (3) 8
Medicare Part D subsidy 2 2
Benefits paid (25) (25)
Projected benefit obligation, end of year 266 278
Fair value of plan assets [Member]
   
Benefits paid (25) (25)
Fair value of plan assets, beginning of year 0 0
Company contributions 25 25
Fair value of plan assets, end of year $ 0 $ 0