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Stockholders' Equity - Components of Share-based Compensation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pretax Charges | $ 39 | $ 27 | $ 46
Net-of-Tax Amount | 37 | 26 | 40
Restructuring settled without cash |  |  | 23
RSAs, PSAs and PSUs (defined below) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pretax Charges | 29 | 17 | 39
Net-of-Tax Amount | 28 | 17 | 35
Employee stock purchase plan and stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pretax Charges | 10 | 10 | 7
Net-of-Tax Amount | $ 9 | $ 9 | $ 5

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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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