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Acquisitions and Sale of Businesses - Allocation of the purchase price of subsidiary 2 (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 06, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Business Acquisitions [Line Items] |  |  |  |
Cash paid at purchase |  | $ 234 | $ 10 | $ 123
Verikai, Inc. |  |  |  |
Business Acquisitions [Line Items] |  |  |  |
Cash paid at purchase | $ 120 |  |  |
Contingent consideration — acquisitions | 23 |  |  |
Total purchase price | 143 |  |  |
Total tangible assets acquired | 16 |  |  |
Total liabilities acquired | 3 |  |  |
Net tangible assets acquired, at fair value | 13 |  |  |
Excess purchase price over net tangible assets acquired | 130 |  |  |
Deferred tax on intangible assets acquired | 16 |  |  |
Goodwill acquired during period | $ 70 |  |  | $ 70

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