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) - Other Postretirement Benefit Plan [Member] - USD ($)
$ in Millions
12 Months Ended
Jan. 28, 2017
Jan. 30, 2016
Jan. 31, 2015
Projected benefit obligation, beginning of year $ 212 $ 243  
Service cost 0 0 $ 0
Interest cost 6 8 10
Actuarial (gain) loss (13) (22)  
Medicare Part D subsidy 1 1  
Benefits paid (20) (18)  
Projected benefit obligation, end of year 186 212 243
Fair value of plan assets, beginning of year 0 0  
Company contributions 20 18  
Fair value of plan assets, end of year 0 0 $ 0
Funded status at end of year 186 212  
Accounts payable and accrued liabilities (18) (20)  
Other liabilities (168) (192)  
Defined Benefit Plan, Amounts Recognized in Balance Sheet (186) (212)  
Net actuarial (gain) loss (31) $ (22)  
Defined Benefit Plan, Future Amortization of Gain (Loss) $ 4