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Pension and Postretirement Health Care Plans - Schedule of Expected Amortization of Amounts in Accumulated Other Comprehensive Income (Details)
$ in Millions
12 Months Ended
Jan. 30, 2016
USD ($)
Pretax  
Net actuarial loss $ 46
Prior service credits (11)
Total amortization expense 35
Net of Tax  
Net actuarial loss 28
Prior service credits (7)
Total amortization expense $ 21