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Stock Repurchases (Details) - USD ($) shares in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 08, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 16, 2018
Stockholders' Equity Note [Abstract] |  |  |  |
Stock repurchase program, authorized amount |  | $ 2,500,000,000.0 |  | $ 500,000,000
Stock repurchase program, remaining authorized amount |  | $ 746,000,000 |  |
Accelerated share repurchases, initial price to be paid | $ 150,000,000 |  |  |
Accelerated share repurchases, percentage of shares to be repurchased | 85.00% |  |  |
Accelerated share repurchases, number of shares | 0.7 |  |  |
Shares repurchased from employees who surrendered shares to satisfy minimum tax withholding obligations |  | 0.1 |  |
Shares repurchased from employees who surrendered shares to satisfy minimum tax withholding obligations, value |  | $ 18,100,000 | $ 13,300,000 |

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- Definition Accelerated Share Repurchases, Number + References No definition available. + Details
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- Definition Accelerated Share Repurchases, Percentages of Shares to be Repurchased + 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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