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Repurchase of Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 05, 2018 | Aug. 04, 2018 | Jul. 29, 2017 | Aug. 04, 2018 | Jul. 29, 2017 | Mar. 01, 2018 | Mar. 01, 2017 | Feb. 27, 2017 | Jun. 30, 2011
Total Share Repurchases [Domain] |  |  |  |  |  |  |  |  |  |
Stock Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  | $ 135 |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares |  | 1.7 |  |  |  |  |  |  |  |
Open market [Domain] |  |  |  |  |  |  |  |  |  |
Stock Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value | [1] |  | $ 375 | $ 397 | $ 774 | $ 781 |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 74.80 | $ 55.07 | $ 73.21 | $ 50.38 |  |  |  |
Stock Repurchased and Retired During Period, Shares | [1] |  | 5.0 | 7.2 | 10.6 | 15.5 |  |  |  |
Unsettled shares, cost |  |  | $ 13 | $ 18 | $ 13 | $ 18 |  |  |  |
Unsettled shares, shares |  |  | 0.2 | 0.3 | 0.2 | 0.3 |  |  |  |
February 2017 share repurchase program [Member] |  |  |  |  |  |  |  |  |  |
Stock Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  | $ 5,000 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  | $ 2,300 |  | $ 2,300 |  |  |  |  |
June 2011 share repurchase program [Member} |  |  |  |  |  |  |  |  |  |
Stock Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  | $ 5,000
Scenario, Plan [Member] |  |  |  |  |  |  |  |  |  |
Stock Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 1,500 |  |  |
Scenario, Plan [Member] | Adjusted Balance [Member] |  |  |  |  |  |  |  |  |  |
Stock Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 3,500 | $ 3,000 |  |
[1] | As of August 4, 2018, $13 million, or 0.2 million shares, in trades remained unsettled. As of July 29, 2017, $18 million, or 0.3 million shares, in trades remained unsettled. The liability for unsettled trades is included in Accrued liabilities on our Condensed Consolidated Balance Sheets.

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