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Goodwill and Intangible Assets - Summary of intangible assets by major class (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | $ 1,523 | $ 1,523 |
Intangible assets with a finite life, accumulated amortization | (766) | (677) |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | (26) | (42) |
Goodwill and intangible assets | 731 | 804 | $ 945
Intangible liability - unfavorable service contract |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | (10) | (10) |
Intangible assets with a finite life, 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] |  |  |
Intangible assets with a finite life, accumulated amortization | (766) |  |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | (23) |  |
Intangible assets with a finite life | Acquired insurance contracts |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 452 | 452 |
Intangible assets with a finite life, accumulated amortization | (441) | (426) |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 0 | (1) |
Goodwill and intangible assets | 11 | 25 |
Intangible assets with a finite life | Operating platform |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 64 | 53 |
Intangible assets with a finite life, accumulated amortization | (54) | (50) |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 0 | 0 |
Goodwill and intangible assets | 10 | 3 |
Intangible assets with a finite life | Distribution relationships |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 594 | 602 |
Intangible assets with a finite life, accumulated amortization | (277) | (208) |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | (23) | (31) |
Goodwill and intangible assets | 294 | 363 |
Intangible assets with a finite life | Other |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 5 | 5 |
Intangible assets with a finite life, accumulated amortization | (4) | (3) |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 0 | 0 |
Goodwill and intangible assets | 1 | 2 |
Goodwill |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 348 | 351 |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | (3) | (9) |
Goodwill and intangible assets | 345 | 342 |
Intangible assets with an indefinite life |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 0 |  |
Intangible assets with an indefinite life | Insurance licenses |  |  |
Schedule of Goodwill And Intangible Assets [Line Items] |  |  |
Gross balance | 48 | 48 |
Goodwill and intangible assets, accumulated foreign currency translation and other adjustments | 0 | 0 |
Goodwill and intangible assets | 48 | 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 | 0 | (1) |
Goodwill and intangible assets | $ 22 | $ 21 |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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