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Acquisition (Details) - USD ($) $ in Millions | Aug. 01, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Liabilities Acquired |  |  |  |  |
Goodwill |  |  | $ 571 | $ 345 | $ 342
Deferred tax asset, goodwill and intangibles |  |  | $ 1,034 | $ 1,020 |
US MidCorp and Entertainment |  |  |  |  |
Purchase price |  |  |  |  |
Business acquisition, cash paid |  | $ 450 |  |  |
Assets Acquired |  |  |  |  |
Cash and investments, at fair value |  | 2,332 |  |  |
Premiums receivable, net of commissions |  | 265 |  |  |
Other assets acquired |  | 167 |  |  |
Total assets acquired |  | 3,327 |  |  |
Liabilities Acquired |  |  |  |  |
Reserves for losses and loss adjustment expenses |  | 2,418 |  |  |
Unearned premiums |  | 636 |  |  |
Other liabilities acquired |  | 69 |  |  |
Total liabilities acquired |  | 3,123 |  |  |
Identifiable net assets acquired |  | 204 |  |  |
Goodwill |  | 246 |  |  |
Deferred tax asset, goodwill and intangibles |  | 565 |  |  |
Net deferred tax asset, loss reserves and unearned premiums |  | 24 |  |  |
US MidCorp and Entertainment | Reserves For Losses And Loss Adjustment Expenses |  |  |  |  |
Liabilities Acquired |  |  |  |  |
Loss reserves, fair value adjustment |  | 128 |  |  |
US MidCorp and Entertainment | Distribution relationships |  |  |  |  |
Assets Acquired |  |  |  |  |
Intangible assets |  | $ 220 |  |  |
Useful life |  | 10 years |  |  |
US MidCorp and Entertainment | Value of business acquired |  |  |  |  |
Assets Acquired |  |  |  |  |
Intangible assets |  | $ 165 |  |  |
US MidCorp and Entertainment | Value of business acquired | Minimum |  |  |  |  |
Assets Acquired |  |  |  |  |
Useful life |  | 1 year |  |  |
US MidCorp and Entertainment | Value of business acquired | Maximum |  |  |  |  |
Assets Acquired |  |  |  |  |
Useful life |  | 2 years |  |  |
US MidCorp and Entertainment | Other intangible assets |  |  |  |  |
Assets Acquired |  |  |  |  |
Intangible assets | [1] | $ 178 |  |  |
US MidCorp and Entertainment | Other intangible assets | Minimum |  |  |  |  |
Assets Acquired |  |  |  |  |
Useful life |  | 5 years |  |  |
US MidCorp and Entertainment | Other intangible assets | Maximum |  |  |  |  |
Assets Acquired |  |  |  |  |
Useful life |  | 7 years |  |  |
[1] | Includes $128 million related to the net fair value adjustment to reserves for loss and loss adjustment expenses on August 1, 2024.

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