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Shareholders' Equity - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Rate of options exercisable per year, commencing one year after grant | 20% per year commencing one year after grant |  |  |  |
Duration of options expiration, after date of grant | 10 years |  |  |  |
Total intrinsic value of options exercised | $ 17 | $ 46 | $ 57 |  |
Cash received from the exercise of stock options | 14 | 31 | 29 |  |
Tax benefit related to exercise of stock options | 3 | 8 | 9 |  |
Total compensation expense related to stock incentive plans | 20 | 23 | 23 |  |
Tax benefit related to compensation costs | 9 | 13 | 13 |  |
Cumulative effect of accounting change | 6,789 | 6,269 | 4,972 |  | $ 5,331
Cumulative effect, period of adoption, adjustment |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Cumulative effect of accounting change |  |  |  |  | $ 4
Accumulated net investment gain (loss) attributable to parent | Cumulative effect, period of adoption, adjustment |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Cumulative effect of accounting change | $ 0 | 0 |  | $ (221) |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted common stock vesting period | 4 years |  |  |  |
Restricted Common Stock vested during period, fair value | $ 19 | $ 11 | $ 10 |  |
Unrecognized compensation expense related to equity-based awards that have yet to vest | $ 35 |  |  |  |
Weighted average period of cost expected to be recognized | 2 years 6 months |  |  |  |
Share-based Payment Arrangement |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures | 0 | 0 | 0 |  |
Common Stock reserved for issuance under stock incentive plans (shares) | 3,900,000 |  |  |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense related to equity-based awards that have yet to vest | $ 0 |  |  |  |

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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. 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