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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |
Value of business acquired and other intangible assets | $ 21 | $ 5
Loss carryforwards | 2,900 |
Foreign tax credit carryforwards | 15 |
Deferred tax assets, operating loss carryforwards, subject to expiration | 232 |
Deferred tax assets, operating loss carryforwards, not subject to expiration | 2,600 |
Deferred tax assets, tax credit carryforwards, alternative minimum tax | 73 |
Domestic Tax Jurisdiction |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |
Deferred tax assets, capital loss carryforwards | 106 |
Office of the Tax Commissioner, Bermuda |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |
Deferred tax assets, capital loss carryforwards | 377 | $ 35
Deferred foreign income tax expense (benefit) | 292 |
Deferred other tax expense (benefit) | $ 50 |

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