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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | $ 62,332 |  | $ 59,663 |
Fixed maturity securities, available-for-sale | 54,171 | [1] | 52,901 | [2]
Corporate Debt Securities [Member] |  |  |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | 41,463 |  | 38,963 |
Fixed maturity securities, available-for-sale | $ 35,503 | [1] | $ 33,969 | [2]
% of Total | 100.00% |  | 100.00% |
Corporate Debt Securities [Member] | Finance |  |  |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | $ 15,022 |  | $ 14,551 |
Fixed maturity securities, available-for-sale | $ 12,842 |  | $ 12,680 |
% of Total | 36.10% |  | 37.30% |
Corporate Debt Securities [Member] | Industrial |  |  |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | $ 21,062 |  | $ 19,624 |
Fixed maturity securities, available-for-sale | $ 18,232 |  | $ 17,257 |
% of Total | 51.40% |  | 50.80% |
Corporate Debt Securities [Member] | Utility |  |  |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | $ 5,379 |  | $ 4,788 |
Fixed maturity securities, available-for-sale | $ 4,429 |  | $ 4,032 |
% of Total | 12.50% |  | 11.90% |
[1] | Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of September 30, 2023, the fair value of such investments was $818 million.
[2] | Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of December 31, 2022, the fair value of such investments was $683 million

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