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Reinsurance - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Effects of Reinsurance [Line Items] |  |  |  |
Reinsurance asset, allowance for credit loss |  | $ 220 | $ 206 |
Reinsurance recoverables |  | 40,500 | 41,400 |
Ceded reserves |  | $ 3,400 |  |
Due from reinsurers (as a percent) |  | 5.00% |  |
Unsecured | Reinsurer Concentration Risk [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Reinsurance recoverables |  | $ 2,100 | 2,300 |
Secured | Reinsurer Concentration Risk [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Reinsurance recoverables |  | 15,200 | 16,500 |
Short-Duration Insurance |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Reinsurance recoverables |  | 5,200 | 8,100 | $ 7,100
Ceded loss reserves |  | 11,500 | 12,400 |
Deferred gain liability |  | 725 | 585 |
Amortization of deferred gain |  | $ 406 | $ 82 | $ 252
Short-Duration Insurance | NICO |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Reserve risk (as a percent) | 80.00% |  |  |
Insurance contract losses | $ 25,000 |  |  |
Investment Grade |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Reinsurance recoverable (as a percent) |  | 83.00% | 83.00% |
Non-Investment Grade |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Reinsurance recoverable (as a percent) |  | 15.00% | 15.00% |
Non-Investment Grade | Captive Insurers |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Reinsurance recoverable (as a percent) |  | 81.00% | 85.00% |
Not Rated |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Reinsurance recoverable (as a percent) |  | 2.00% | 2.00% |

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