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Goodwill and Intangible Assets - Summary of intangible assets by major class (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | $ 2,412 | $ 2,380 |
Accumulated amortization | (1,171) | (994) |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | (19) | (35) |
Goodwill and intangible assets | 1,222 | 1,351 | $ 731
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 | 1,726 |  |
Accumulated amortization | (1,171) |  |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | (21) |  |
Goodwill and intangible assets | 534 |  |
Intangible assets with a finite life | Acquired insurance contracts |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 620 | 620 |
Accumulated amortization | (619) | (562) |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 0 | 1 |
Goodwill and intangible assets | 1 | 59 |
Intangible assets with a finite life | Operating platform |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 117 | 117 |
Accumulated amortization | (78) | (63) |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 0 | 0 |
Goodwill and intangible assets | 39 | 54 |
Intangible assets with a finite life | Distribution relationships |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 865 | 865 |
Accumulated amortization | (427) | (358) |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | (21) | (30) |
Goodwill and intangible assets | 417 | 477 |
Intangible assets with a finite life | Other |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 134 | 132 |
Accumulated amortization | (57) | (21) |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 0 | 0 |
Goodwill and intangible assets | 77 | 111 |
Goodwill |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 606 | 576 |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 1 | (5) |
Goodwill and intangible assets | 607 | 571 |
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 | 81 |  |
Intangible assets with an indefinite life | Insurance licenses |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 58 | 58 |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 0 | 0 |
Goodwill and intangible assets | 58 | 58 |
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 | (1) |
Goodwill and intangible assets | $ 23 | $ 21 |

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