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Shareholders' Equity - Regulatory Requirements (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Statutory Accounting Practices [Line Items] |  |  |
Estimated minimum statutory surplus required by regulators | $ 9,011 |  |
Investments on deposit with regulatory bodies | 684 |  |
Estimated maximum dividend distributions permitted in 2024 without prior regulatory approval | 3,098 |  |
Insurance and HMO |  |  |
Statutory Accounting Practices [Line Items] |  |  |
Statutory net income | 2,757 | $ 2,851 | $ 3,302
Estimated statutory capital and surplus | 16,961 | $ 15,503 | $ 14,879
Dividends paid | $ 1,900 |  |

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