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Investments (Maturities of Fixed Maturity Securities) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Available-for-sale Securities, Debt Maturities [Abstract] |  |
Amortized Cost, Due in one year or less | $ 10,447 |
Amortized Cost, Due after one year through five years | 48,816 |
Amortized Cost, Due after five years through ten years | 52,088 |
Amortized Cost, Due after ten years | 127,103 |
Amortized Cost, Structured Securities | 62,056 |
Amortized Cost, net of ACL | 300,510 |
Estimated Fair Value, Due in one year or less | 10,498 |
Estimated Fair Value, Due after one year through five years | 48,055 |
Estimated Fair Value, Due after five years through ten years | 50,283 |
Estimated Fair Value, Due after ten years | 111,325 |
Estimated Fair Value, Structured Securities | 58,248 |
Estimated Fair Value of Fixed Maturity Securities AFS | $ 278,409 | $ 281,412

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