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Shareholders' Equity - Regulatory Requirements (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Statutory Accounting Practices [Line Items] |  |  |
Estimated minimum statutory surplus required by regulators | $ 7,741 |  |
Investments on deposit with regulatory bodies | 652 |  |
Estimated maximum dividend distributions permitted in 2023 without prior regulatory approval | 2,706 |  |
Insurance and HMO |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory net income | 2,851 | $ 3,302 | $ 3,667
Estimated statutory capital and surplus | 15,503 | $ 14,879 | $ 13,238
Dividends paid | $ 3,200 |  |

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