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Goodwill and Other Intangibles - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Goodwill [Line Items] |  |  |  |  |
Goodwill, impairment loss |  | $ (26) |  |  |
Amortizable intangible assets related to acquisitions | $ 213 |  | $ 213 | $ 108 |
Accumulated amortization | 39 |  | 39 | 24 |
Amortization of intangible assets |  |  | $ 15 | $ 11 | $ 6
Weighted average useful life of finite-lived intangible assets acquired |  |  | 6 years |  |
Future amortization of intangibles in next year | 20 |  | $ 20 |  |
Future amortization of intangibles in year two | 19 |  | 19 |  |
Future amortization of intangibles in year three | 19 |  | 19 |  |
Future amortization of intangibles in year four | 20 |  | 20 |  |
Future amortization of intangibles in year five | 17 |  | 17 |  |
Future amortization of intangibles after year five | 118 |  | $ 118 |  |
Verikai, Inc. |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, impairment loss | $ (26) |  |  |  |

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