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Reinsurance - Summary of the Composition of Pool of Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Effects of Reinsurance [Line Items] |  |  |
Bonds available for sale | [1] | $ 64,006 | $ 65,242
Fixed maturity securities - fair value option |  | 745 | 663
Short-term investments | [1] | 14,462 | 12,865
Other assets | [1] | 4,735 | 5,425
Total assets |  | 161,322 | 539,306
Carrying Value |  |  |
Effects of Reinsurance [Line Items] |  |  |
Short-term investments |  | 4,673 | 3,502
Other assets |  | 15 | 32
Commercial mortgage loans |  |  |
Effects of Reinsurance [Line Items] |  |  |
Loans |  | 3,305 | 3,836
Fortitude Holdings |  |  |
Effects of Reinsurance [Line Items] |  |  |
Change in net unrealized gains (losses), gross |  | (35) | 116
Change in net unrealized gains (losses), net of tax |  | (28) | 92
Derivative asset, Fair value of collateral |  | 9 | 1
Derivative liability, Fair value of collateral |  | 2 | 28
Fortitude Holdings | Carrying Value |  |  |
Effects of Reinsurance [Line Items] |  |  |
Bonds available for sale |  | 1,918 | 2,180
Fixed maturity securities - fair value option |  | 721 | 655
Short-term investments |  | 15 | 46
Funds withheld investment assets |  | 3,104 | 3,424
Derivative assets, net |  | 1 | 0
Other assets |  | 115 | 118
Total assets |  | 3,220 | 3,542
Fortitude Holdings | Estimated Fair Value |  |  |
Effects of Reinsurance [Line Items] |  |  |
Bonds available for sale |  | 1,918 | 2,180
Fixed maturity securities - fair value option |  | 721 | 655
Short-term investments |  | 15 | 46
Funds withheld investment assets |  | 3,091 | 3,409
Derivative assets, net |  | 1 | 0
Other assets, fair value |  | 115 | 118
Total |  | 3,207 | 3,527
Fortitude Holdings | Commercial mortgage loans | Carrying Value |  |  |
Effects of Reinsurance [Line Items] |  |  |
Loans |  | 450 | 543
Fortitude Holdings | Commercial mortgage loans | Estimated Fair Value |  |  |
Effects of Reinsurance [Line Items] |  |  |
Loans, fair value |  | $ 437 | $ 528
[1] | See Note 10 for details of balances associated with variable interest entities.

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