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Reinsurance - Summary of the Composition of Pool of Assets (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Effects of Reinsurance [Line Items] |  |  |  |
Bonds available for sale | [1] | $ 62,333 |  | $ 65,242
Fixed maturity securities - fair value option | [1] | 766 |  | 663
Short-term investments | [1] | 12,563 |  | 12,865
Other assets | [1] | 4,717 |  | 5,425
Total assets |  | 167,890 |  | 539,306
Carrying Value |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Short-term investments |  | 4,426 |  | 3,502
Other assets |  | 18 |  | 32
Commercial mortgage loans |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Loans |  | 3,728 |  | 3,836
Fortitude Holdings |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Change in net unrealized gains (losses), gross |  | (53) | $ 21 |
Change in net unrealized gains (losses), net of tax |  | (42) | $ 16 |
Derivative asset, Fair value of collateral |  | 3 |  | 1
Derivative liability, Fair value of collateral |  | 27 |  | 28
Fortitude Holdings | Carrying Value |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Bonds available for sale |  | 1,997 |  | 2,180
Fixed maturity securities - fair value option |  | 761 |  | 655
Short-term investments |  | 18 |  | 46
Funds withheld investment assets |  | 3,250 |  | 3,424
Derivative assets, net |  | 1 |  | 0
Other assets |  | 126 |  | 118
Total assets |  | 3,377 |  | 3,542
Fortitude Holdings | Estimated Fair Value |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Bonds available for sale |  | 1,997 |  | 2,180
Fixed maturity securities - fair value option |  | 761 |  | 655
Short-term investments |  | 18 |  | 46
Funds withheld investment assets |  | 3,237 |  | 3,409
Derivative assets, net |  | 1 |  | 0
Other assets, fair value |  | 126 |  | 118
Total |  | 3,364 |  | 3,527
Fortitude Holdings | Commercial mortgage loans | Carrying Value |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Loans |  | 474 |  | 543
Fortitude Holdings | Commercial mortgage loans | Estimated Fair Value |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Loans, fair value |  | $ 461 |  | $ 528
[1] | See Note 10 for details of balances associated with variable interest entities.

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