Repurchase of Common Stock Repuchase of Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Apr. 29, 2017	Apr. 30, 2016
Open market [Domain]
Stock Repurchases [Line Items]
Stock Repurchased and Retired During Period, Value	[1]	$ 384	$ 56
Average share price		$ 46.30	$ 32.41
Stock Repurchased and Retired During Period, Shares	[1]	8.3	1.7
Unsettled shares, cost		$ 19	$ 4
Unsettled shares, shares		0.3	0.1
January 2016 ASR [Domain]
Stock Repurchases [Line Items]
Stock Repurchased and Retired During Period, Value		$ 0	$ 45	[2]
Average share price		$ 0.00	$ 28.55	[2]
Stock Repurchased and Retired During Period, Shares		0.0	1.6	[2]
Total Share Repurchases [Domain]
Stock Repurchases [Line Items]
Stock Repurchased and Retired During Period, Value		$ 384	$ 101
Average share price		$ 46.30	$ 30.55
Stock Repurchased and Retired During Period, Shares		8.3	3.3

[1] As of April 29, 2017, $19 million, or 0.3 million shares, in trades remained unsettled. As of April 30, 2016, $4 million, or 0.1 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.