Discontinued Operations Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 29, 2016	Oct. 31, 2015	Oct. 29, 2016	Oct. 31, 2015
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenue	$ 0	$ 0	$ 0	$ 217
Gain (loss) from discontinued operations before income tax benefit (expense)	2	(4)	28	(14)
Income tax benefit (expense)	0	0	(7)	3
Gain on sale of discontinued operations	0	0	0	99
Net gain (loss) from discontinued operations	$ 2	$ (4)	$ 21	$ 88