Repurchase of Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jul. 29, 2017	Jul. 30, 2016	Jul. 29, 2017	Jul. 30, 2016
Open market [Domain]
Stock Repurchases [Line Items]
Stock Repurchased and Retired During Period, Value	[1]	$ 397	$ 221	$ 781	$ 277
Average share price		$ 55.07	$ 30.65	$ 50.38	$ 30.98
Stock Repurchased and Retired During Period, Shares	[1]	7.2	7.2	15.5	8.9
Unsettled shares, cost		$ 18	$ 6	$ 18	$ 6
Unsettled shares, shares		0.3	0.2	0.3	0.2
January 2016 ASR [Domain]
Stock Repurchases [Line Items]
Stock Repurchased and Retired During Period, Value	[2]	$ 0	$ 0	$ 0	$ 45
Average share price	[2]	$ 0.00	$ 0.00	$ 0.00	$ 28.55
Stock Repurchased and Retired During Period, Shares	[2]	0.0	0.0	0.0	1.6
Total Share Repurchases [Domain]
Stock Repurchases [Line Items]
Stock Repurchased and Retired During Period, Value		$ 397	$ 221	$ 781	$ 322
Average share price		$ 55.07	$ 30.65	$ 50.38	$ 30.62
Stock Repurchased and Retired During Period, Shares		7.2	7.2	15.5	10.5

[1] As of July 29, 2017, $18 million, or 0.3 million shares, in trades remained unsettled. As of July 30, 2016, $6 million, or 0.2 million shares, in trades remained unsettled. The liability for unsettled trades is included in Accrued liabilities in the Condensed Consolidated Balance Sheets.

[2] See Note 7, Shareholders' Equity, in the Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for the fiscal year ended January 28, 2017, for additional information regarding the January 2016 ASR.