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Investments (Fixed Maturity Securities Pledged And Received As Collateral) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [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]
Assets Held-in-trust | 0 |  | 465 |
Estimate of Fair Value Measurement [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Assets Held-in-trust | 27,817 |  | 31,173 |
Carrying Value [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Assets Held-in-trust | 31,510 |  | 28,671 |
Collateral Fixed Maturity Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 355 |  | 100 |
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) | 292 |  | 103 |
Collateral Received Fixed Maturity Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
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) | $ 1,428 |  | $ 1,922 |
[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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