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Discontinued Operations Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 29, 2017	Jul. 30, 2016	Apr. 30, 2016	May 02, 2015
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Gain on sale of discontinued operations				$ 99
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax		$ 16
Income tax benefit	$ 0		$ 3
Net gain from discontinued operations	$ 0		$ 3

Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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