Fair Value Measurements Fair Value Measurements (Securities Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Apr. 30, 2016	Feb. 02, 2019	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized Gain (Loss) on Securities		$ 6	$ 0	$ 0
Marketable Securities, Equity Securities, Current		0	10	0	$ 10
Proceeds from Sale of Available-for-sale Securities, Equity	$ 10
Available-for-sale Securities, Gross Realized Gains		0	0	4
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	3	$ 0	$ 0	$ 3
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Gross Realized Gains	$ 4