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Stockholders' Equity - Components of Share-based Compensation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pretax Charges | $ 72 | $ 57 | $ 39
Net-of-Tax Amount | 68 | 53 | 37
RSAs, PSAs and PSUs (defined below) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pretax Charges | 66 | 47 | 29
Net-of-Tax Amount | 62 | 44 | 28
Employee stock purchase plan and stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pretax Charges | 6 | 10 | 10
Net-of-Tax Amount | $ 6 | $ 9 | $ 9

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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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