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Stockholders' Equity - Components of Share-based Compensation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pretax Charges | $ 57 | $ 39 | $ 27
Net-of-Tax Amount | 53 | 37 | 26
RSAs, PSAs and PSUs (defined below) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pretax Charges | 47 | 29 | 17
Net-of-Tax Amount | 44 | 28 | 17
Employee stock purchase plan and stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pretax Charges | 10 | 10 | 10
Net-of-Tax Amount | $ 9 | $ 9 | $ 9

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