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Goodwill and Intangible Assets - Analysis of goodwill and intangible assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Goodwill |  |  |  |
Goodwill, beginning of year | $ 345 |  | $ 342 |
Goodwill, acquisitions | 246 | [1] | 0 |
Goodwill, impairment |  |  | (2) |
Goodwill, foreign currency translation adjustment | (20) | [2] | 5 |
Goodwill, end of year | 571 |  | 345 | $ 342
Intangible assets (indefinite life) |  |  |  |
Intangible assets with an indefinite life, beginning of year | 70 |  | 69 |
Intangible assets with an indefinite life, acquisitions | 9 | [1] | 0 |
Impairment |  |  | 0 |
Intangible assets with an indefinite life, foreign currency translation adjustment | 0 | [2] | 1 |
Intangible assets with an indefinite life, end of year | 79 |  | 70 | 69
Intangible assets (finite life) |  |  |  |
Intangible assets with a finite life, beginning of year | 316 |  | 393 |
Intangible assets with a finite life, acquisitions | 637 | [1] | 11 |
Intangible assets with a finite life, amortization | (235) |  | (95) | (106)
Intangible assets with a finite life, impairment |  |  | 0 |
Intangible assets with a finite life, foreign currency translation adjustment | (17) | [2] | 7 |
Intangible assets with a finite life, end of year | 701 |  | 316 | 393
Total |  |  |  |
Goodwill and intangible assets, beginning of year | 731 |  | 804 |
Goodwill and intangible assets, acquisitions | 892 |  | 11 |
Goodwill and intangible assets impairment |  |  | (2) |
Goodwill and intangible assets, foreign currency movements and other adjustments | (37) | [2] | 13 |
Goodwill and intangible assets, end of year | 1,351 |  | 731 | 804
Reconciliation of gross to net |  |  |  |
Gross balance | 2,380 |  | 1,523 |
Accumulated amortization | (994) |  | (766) |
Foreign currency movements and other adjustments | (35) |  | (26) |
Goodwill and intangible assets | 1,351 |  | 731 | $ 804
Goodwill |  |  |  |
Total |  |  |  |
Goodwill and intangible assets, beginning of year | 345 |  |  |
Goodwill and intangible assets, end of year | 571 |  | 345 |
Reconciliation of gross to net |  |  |  |
Gross balance | 576 |  | 348 |
Foreign currency movements and other adjustments | (5) |  | (3) |
Goodwill and intangible assets | 571 |  | $ 345 |
Intangible assets with an indefinite life |  |  |  |
Total |  |  |  |
Goodwill and intangible assets, end of year | 79 |  |  |
Reconciliation of gross to net |  |  |  |
Gross balance | 80 |  |  |
Foreign currency movements and other adjustments | (1) |  |  |
Goodwill and intangible assets | 79 |  |  |
Intangible assets with a finite life |  |  |  |
Total |  |  |  |
Goodwill and intangible assets, end of year | 701 |  |  |
Reconciliation of gross to net |  |  |  |
Gross balance | 1,724 |  |  |
Accumulated amortization | (994) |  |  |
Foreign currency movements and other adjustments | (29) |  |  |
Goodwill and intangible assets | $ 701 |  |  |
[1] | Certain amounts for the Company’s 2024 acquisitions are consideredprovisional.
[2] | Amount primarily related to the sale of Castel Underwriting Agencies Limited.

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