Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions	Oct. 29, 2017	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
Derivative agreements - net fair value	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative agreements - assets	189	271
Derivative agreements - liabilities	(9)	0
Derivative agreements - net fair value	180	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
Derivative agreements - net fair value	$ 0	$ 0