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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Jan. 28, 2018
Jan. 29, 2017
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative agreements - assets $ 0 $ 0
Derivative agreements - liabilities 0 0
Total 0 0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative agreements - assets 235 271
Derivative agreements - liabilities (12) 0
Total 223 271
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative agreements - assets 0 0
Derivative agreements - liabilities 0 0
Total $ 0 $ 0