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Investments (Fixed Maturity Securities Pledged And Received As Collateral) (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | $ 76,161 |  | $ 64,977 |
Fixed maturity securities, available-for-sale | 70,491 | [1] | 60,467 | [2]
Collateral Fixed Maturity Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 1,108 |  | 572 |
Fixed maturity securities, available-for-sale | 960 |  | 517 |
Collateral Received Fixed Maturity Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Fixed maturity securities, available-for-sale | 2,040 |  | 1,827 |
Reported Value Measurement [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Assets Held-in-trust | 42,810 |  | 32,758 |
Estimate of Fair Value Measurement [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Assets Held-in-trust | 39,907 |  | 30,359 |
Deposits |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 12 |  | 12 |
Fixed maturity securities, available-for-sale | 9 |  | 9 |
Federal Home Loan Bank Certificates and Obligations (FHLB) |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available for Sale at Fair value - Amortized cost | 73 |  | 63 |
Fixed maturity securities, available-for-sale | $ 73 |  | $ 63 |
[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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