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Goodwill and Intangible Assets - Summary of intangible assets by major class (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | $ 2,380 | $ 1,523 |
Accumulated amortization | (994) | (766) |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | (35) | (26) |
Goodwill and intangible assets | 1,351 | 731 | $ 804
Intangible liability - unfavorable service contract |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | (10) | (10) |
Accumulated amortization | 10 | 10 |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 0 | 0 |
Goodwill and intangible assets | 0 | 0 |
Intangible assets with a finite life |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 1,724 |  |
Accumulated amortization | (994) |  |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | (29) |  |
Goodwill and intangible assets | 701 |  |
Intangible assets with a finite life | Acquired insurance contracts |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 620 | 452 |
Accumulated amortization | (562) | (441) |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 1 | 0 |
Goodwill and intangible assets | 59 | 11 |
Intangible assets with a finite life | Operating platform |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 117 | 64 |
Accumulated amortization | (63) | (54) |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 0 | 0 |
Goodwill and intangible assets | 54 | 10 |
Intangible assets with a finite life | Distribution relationships |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 865 | 594 |
Accumulated amortization | (358) | (277) |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | (30) | (23) |
Goodwill and intangible assets | 477 | 294 |
Intangible assets with a finite life | Other |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 132 | 5 |
Accumulated amortization | (21) | (4) |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 0 | 0 |
Goodwill and intangible assets | 111 | 1 |
Goodwill |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 576 | 348 |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | (5) | (3) |
Goodwill and intangible assets | 571 | 345 |
Intangible assets with an indefinite life |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 80 |  |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | (1) |  |
Goodwill and intangible assets | 79 |  |
Intangible assets with an indefinite life | Insurance licenses |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 58 | 48 |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 0 | 0 |
Goodwill and intangible assets | 58 | 48 |
Intangible assets with an indefinite life | Syndicate capacity |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 22 | 22 |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | (1) | 0 |
Goodwill and intangible assets | $ 21 | $ 22 |

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