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Goodwill and Intangible Assets - Analysis of goodwill and intangible assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Goodwill |  |  |  |
Goodwill, beginning of year | $ 571 | $ 345 |  |
Goodwill, acquisitions | 30 | 246 |  |
Goodwill, foreign currency translation adjustment | 6 | (20) | [1] |
Goodwill, end of year | 607 | 571 |  | $ 345
Intangible assets (indefinite life) |  |  |  |
Intangible assets with an indefinite life, beginning of year | 79 | 70 |  |
Intangible assets with an indefinite life, acquisitions | 0 | 9 |  |
Intangible assets with an indefinite life, foreign currency translation adjustment | 2 | 0 | [1] |
Intangible assets with an indefinite life, end of year | 81 | 79 |  | 70
Intangible assets (finite life) |  |  |  |
Intangible assets with a finite life, beginning of year | 701 | 316 |  |
Intangible assets with a finite life, acquisitions | 2 | 637 |  |
Intangible assets with a finite life, amortization | (193) | (235) |  | (95)
Intangible assets with a finite life, foreign currency translation adjustment | 24 | (17) | [1] |
Intangible assets with a finite life, end of year | 534 | 701 |  | 316
Total |  |  |  |
Goodwill and intangible assets, beginning of year | 1,351 | 731 |  |
Goodwill and intangible assets, acquisitions | 32 | 892 |  |
Goodwill and intangible assets, foreign currency movements and other adjustments | 32 | (37) | [1] |
Goodwill and intangible assets, end of year | 1,222 | 1,351 |  | 731
Reconciliation of gross to net |  |  |  |
Gross balance | 2,412 | 2,380 |  |
Accumulated amortization | (1,171) | (994) |  |
Foreign currency movements and other adjustments | (19) | (35) |  |
Goodwill and intangible assets | 1,222 | 1,351 |  | $ 731
Goodwill |  |  |  |
Total |  |  |  |
Goodwill and intangible assets, beginning of year | 571 |  |  |
Goodwill and intangible assets, end of year | 607 | 571 |  |
Reconciliation of gross to net |  |  |  |
Gross balance | 606 | 576 |  |
Foreign currency movements and other adjustments | 1 | (5) |  |
Goodwill and intangible assets | 607 | $ 571 |  |
Intangible assets with an indefinite life |  |  |  |
Total |  |  |  |
Goodwill and intangible assets, end of year | 81 |  |  |
Reconciliation of gross to net |  |  |  |
Gross balance | 80 |  |  |
Foreign currency movements and other adjustments | 1 |  |  |
Goodwill and intangible assets | 81 |  |  |
Intangible assets with a finite life |  |  |  |
Total |  |  |  |
Goodwill and intangible assets, end of year | 534 |  |  |
Reconciliation of gross to net |  |  |  |
Gross balance | 1,726 |  |  |
Accumulated amortization | (1,171) |  |  |
Foreign currency movements and other adjustments | (21) |  |  |
Goodwill and intangible assets | $ 534 |  |  |
[1] | Amount primarily related to the sale of Castel Underwriting AgenciesLimited

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