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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | $ 76,161 |  | $ 64,977 |
Fixed maturity securities, available-for-sale | $ 70,491 | [1] | $ 60,467 | [2]
% of Total | 100.00% |  | 100.00% |
Corporate Debt Securities [Member] |  |  |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | $ 50,053 |  | $ 42,014 |
Fixed maturity securities, available-for-sale | $ 46,131 | [1] | $ 38,755 | [2]
% of Total | 65.40% |  | 64.10% |
Percentage Of Total Corporate Fixed Maturity Security | 100.00% |  | 100.00% |
Corporate Debt Securities [Member] | Finance |  |  |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | $ 16,448 |  | $ 15,052 |
Fixed maturity securities, available-for-sale | $ 15,090 |  | $ 13,789 |
Percentage Of Total Corporate Fixed Maturity Security | 32.70% |  | 35.60% |
Corporate Debt Securities [Member] | Industrial |  |  |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | $ 26,154 |  | $ 21,413 |
Fixed maturity securities, available-for-sale | $ 24,306 |  | $ 19,935 |
Percentage Of Total Corporate Fixed Maturity Security | 52.70% |  | 51.40% |
Corporate Debt Securities [Member] | Utility |  |  |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Amortized Cost | $ 7,451 |  | $ 5,549 |
Fixed maturity securities, available-for-sale | $ 6,735 |  | $ 5,031 |
Percentage Of Total Corporate Fixed Maturity Security | 14.60% |  | 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 June 30, 2024, the fair value of such investments was $911 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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