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Fair Value (Nonrecurring Fair Value Measurements) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Mortgage loans (1) | $ 89,012 | $ 92,506 |
Other invested assets, at estimated fair value | 18,504 | 18,202 |
Fair Value, Nonrecurring [Member] | Mortgages [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair Value Adjustment | (217) | (215) | $ (13)
Fair Value, Nonrecurring [Member] | Other Investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, Fair Value Adjustment | 0 | (136) | $ 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Mortgage loans (1) | 1,075 | 474 |
Other invested assets, at estimated fair value | $ 63 | $ 63 |

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