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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | $ 59,663 |  | $ 55,873 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | 52,901 | [1] | 60,749 | [2]
Corporate Debt Securities [Member] |  |  |  |
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 38,963 |  | 35,239 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | $ 33,969 | [1] | $ 38,103 | [2]
Percentage Of Total Available For Sales Securities | 100.00% |  | 100.00% |
Financial Services Sector [Member] | Corporate Debt Securities [Member] |  |  |  |
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | $ 14,551 |  | $ 13,101 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | $ 12,680 |  | $ 14,045 |
Percentage Of Total Available For Sales Securities | 37.30% |  | 36.90% |
Commercial and Industrial Sector [Member] | Corporate Debt Securities [Member] |  |  |  |
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | $ 19,624 |  | $ 17,857 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | $ 17,257 |  | $ 19,375 |
Percentage Of Total Available For Sales Securities | 50.80% |  | 50.80% |
Utility Industry [Member] | Corporate Debt Securities [Member] |  |  |  |
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | $ 4,788 |  | $ 4,281 |
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31) | $ 4,032 |  | $ 4,683 |
Percentage Of Total Available For Sales Securities | 11.90% |  | 12.30% |
[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 December 31, 2022, the fair value of such investments was $683 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, 2021, the fair value of such investments was $581 million.

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