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Repurchase of Common Stock Repuchase of Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
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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.

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