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Stock Repurchases (Details) - USD ($) shares in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 27, 2017 | Apr. 28, 2017 | Feb. 09, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stockholders' Equity Note [Abstract] |  |  |  |  |  |
Authorized amount for share repurchase |  |  |  | $ 2,000,000,000 | $ 550,000,000 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  | $ 396,000,000 |  |
Accelerated Share Repurchases, Initial Price Paid | $ 75,000,000 | $ 100,000,000 | $ 75,000,000 |  |  |
Accelerated Share Repurchases, Percentages of Shares to be Repurchased | 85.00% | 85.00% | 85.00% |  |  |
Accelerated Share Repurchases, Number | 0.4 | 0.6 | 0.5 |  |  |
Repurchased shares to satisfy minimum withholding obligations (in shares) |  |  |  | 0.1 | 0.2 |
Repurchased shares to satisfy employee withholding tax obligations |  |  |  | $ 26,100,000 | $ 33,300,000 | $ 32,000,000

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- Definition Accelerated Share Repurchases, Number + References No definition available. + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 25 -Paragraph 19A -URI http://asc.fasb.org/extlink&oid=96949009&loc=SL79513924-113897 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- References No definition available. + Details
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