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Stockholders' Equity - Fair Value of Awards Granted and Vested (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total granted | $ 51 | $ 42
Total vested | 20 | 17
RSAs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total granted | 32 | 26
Total vested | 18 | 14
PSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total granted | 19 | 16
Total vested | 2 | 0
PSAs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total vested | $ 0 | $ 3

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- Definition Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value + References No definition available. + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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