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Stock Repurchases (Details) - USD ($) shares in Millions |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 28, 2017 | Feb. 09, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Stockholders' Equity Note [Abstract] |  |  |  |  |
Stock repurchase program, authorized amount |  |  | $ 2,000,000,000 |  | $ 550,000,000
Stock repurchase program, remaining authorized amount |  |  | $ 471,000,000 |  |
Accelerated share repurchases, initial price to be paid | $ 100,000,000 | $ 75,000,000 |  |  |
Accelerated share repurchases, percentage of shares to be repurchased | 85.00% | 85.00% |  |  |
Accelerated share repurchases, number of shares | 0.5 | 0.5 |  |  |
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 |  |  | $ 14,100,000 | $ 21,400,000 |

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- Definition Accelerated Share Repurchases, Initial Price Paid + References No definition available. + Details
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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 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&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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Balance Type: | credit
Period Type: | instant

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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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