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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | $ 70,790 |  | $ 64,977 |
Fixed maturity securities, available-for-sale | 65,827 | [1] | 60,467 | [2]
Corporate Debt Securities [Member] |  |  |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | 44,575 |  | 42,014 |
Fixed maturity securities, available-for-sale | $ 41,048 | [1] | $ 38,755 | [2]
% of Total | 100.00% |  | 100.00% |
Corporate Debt Securities [Member] | Finance |  |  |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | $ 15,788 |  | $ 15,052 |
Fixed maturity securities, available-for-sale | $ 14,526 |  | $ 13,789 |
% of Total | 35.40% |  | 35.60% |
Corporate Debt Securities [Member] | Industrial |  |  |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | $ 22,606 |  | $ 21,413 |
Fixed maturity securities, available-for-sale | $ 20,946 |  | $ 19,935 |
% of Total | 51.00% |  | 51.40% |
Corporate Debt Securities [Member] | Utility |  |  |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | $ 6,181 |  | $ 5,549 |
Fixed maturity securities, available-for-sale | $ 5,576 |  | $ 5,031 |
% of Total | 13.60% |  | 13.00% |
[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 March 31, 2024, the fair value of such investments was $893 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, 2023, the fair value of such investments was $856 million

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