Fair Value Measurements (Fair Value, Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Oct. 28, 2017	Oct. 29, 2016	Apr. 30, 2016	Oct. 28, 2017	Oct. 29, 2016	Jan. 28, 2017
Available-for-sale Securities, Gross Realized Gains				$ 0	$ 4
Assets:
Cash and Cash Equivalents	$ 735	$ 654		735	654	$ 1,934
Available-for-sale Securities	6	8		6	8	5
Foreign Currency Cash Flow Hedge Asset at Fair Value	15	26		15	26	18
Interest Rate Fair Value Hedges	1	6		1	6	2
Proceeds from Sale of Available-for-sale Securities, Equity			$ 10
Liabilities:
Foreign Currency Cash Flow Hedge Liability at Fair Value	4			4		1
Marketable Securities, Realized Gain (Loss)	0	0	$ (3)	0	(3)
Fair Value, Inputs, Level 1 [Member]
Assets:
Cash and Cash Equivalents	735	654		735	654	1,934
Available-for-sale Securities	6	8		6	8	5
Foreign Currency Cash Flow Hedge Asset at Fair Value	0	0		0	0	0
Interest Rate Fair Value Hedges	0	0		0	0	0
Liabilities:
Foreign Currency Cash Flow Hedge Liability at Fair Value	0			0		0
Fair Value, Inputs, Level 2 [Member]
Assets:
Cash and Cash Equivalents	0	0		0	0	0
Available-for-sale Securities	0	0		0	0	0
Foreign Currency Cash Flow Hedge Asset at Fair Value	15	26		15	26	18
Interest Rate Fair Value Hedges	1	6		1	6	2
Liabilities:
Foreign Currency Cash Flow Hedge Liability at Fair Value	4			4		1
Fair Value, Inputs, Level 3 [Member]
Assets:
Cash and Cash Equivalents	0	0		0	0	0
Available-for-sale Securities	0	0		0	0	0
Foreign Currency Cash Flow Hedge Asset at Fair Value	0	0		0	0	0
Interest Rate Fair Value Hedges	0	$ 0		0	$ 0	0
Liabilities:
Foreign Currency Cash Flow Hedge Liability at Fair Value	$ 0			$ 0		$ 0