Comprehensive Income (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Oct. 29, 2016	Apr. 30, 2016	Oct. 31, 2015	Oct. 29, 2016	Oct. 31, 2015
Accumulated Other Comprehensive Income (Loss), Beginning Balance		$ 40		$ 40	$ 35
Other Comprehensive Income (Loss), before Reclassifications, before Tax				(32)	14
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)				1	(7)
Other Comprehensive Income (Loss), Tax				3	(1)
Current-period Other Comprehensive Income (Loss)	$ (10)		$ 0	(28)	6
Accumulated Other Comprehensive Income (Loss), Ending Balance	12		41	12	41
Other Income	3		0	83	75
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	0	(3)	0	(3)	0
Available-for-sale Securities, Gross Realized Gains				(4)	0
Provision for Income Taxes	68		96	277	335
Net Income	122		164	526	617
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Beginning Balance		28		28	51
Other Comprehensive Income (Loss), before Reclassifications, before Tax				(25)	5
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)				0	0
Other Comprehensive Income (Loss), Tax				0	0
Current-period Other Comprehensive Income (Loss)				(25)	5
Accumulated Other Comprehensive Income (Loss), Ending Balance	3		56	3	56
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Beginning Balance		4		4	(16)
Other Comprehensive Income (Loss), before Reclassifications, before Tax				(1)	6
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)				5	(7)
Other Comprehensive Income (Loss), Tax				(1)	0
Current-period Other Comprehensive Income (Loss)				3	(1)
Accumulated Other Comprehensive Income (Loss), Ending Balance	7		(17)	7	(17)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss), Beginning Balance		8		8	0
Other Comprehensive Income (Loss), before Reclassifications, before Tax				(6)	3
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)				(4)	0
Other Comprehensive Income (Loss), Tax				4	(1)
Current-period Other Comprehensive Income (Loss)				(6)	2
Accumulated Other Comprehensive Income (Loss), Ending Balance	2		2	2	2
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Other Income	(4)		3	5	(7)
Provision for Income Taxes	0		0	0	0
Net Income	(4)		3	5	(7)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Other Income			$ 0		$ 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	0			1
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	0			(3)
Available-for-sale Securities, Gross Realized Gains	$ 0	$ (4)		$ (4)