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Investments (Realized Investment Gains Losses Net) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |
Realized investment gains (losses), net | [1] | $ (3,615) | [2] | $ (4,507) | [3],[4] | $ 2,115 | [3],[4]
Fixed maturities |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |
Realized investment gains (losses), net |  | (1,311) |  | (1,487) |  | 1,939 |
Commercial mortgage and other loans |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |
Realized investment gains (losses), net |  | (255) |  | (133) |  | 173 |
Investment real estate |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |
Realized investment gains (losses), net |  | 45 |  | 83 |  | 108 |
LPs/LLCs |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |
Realized investment gains (losses), net |  | 72 |  | (120) |  | (14) |
Derivatives |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |
Realized investment gains (losses), net |  | (2,234) |  | (2,851) |  | (113) |
Other invested assets |  |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |
Realized investment gains (losses), net |  | $ 68 |  | $ 1 |  | $ 22 |
[1] | See Note 24 for additional information regarding related party transactions.
[2] | See Note 24 for additional information regarding related party transactions.
[3] | Prior period amounts adjusted for the implementation of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.
[4] | Prior period amounts adjusted for the adoption of ASU 2018-12: Targeted Improvements to the Accounting for Long-Duration Contracts.

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