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Investments (Fixed Maturity Securities - Narrative) (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturity securities, estimated fair value | $ 80,474 |  | $ 80,991
Fixed maturity securities, allowance for credit losses | $ 27 |  | 21
Fixed maturity securities with allowance for credit losses, number of securities | 23 |  |
Fixed maturity securities, total write-offs | $ 0 | $ 7 |
Non-Income Producing |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed maturity securities, estimated fair value | 51 |  | 52
Fixed maturity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Accrued interest receivable | $ 709 |  | $ 655

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