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Reinsurance - Insurance Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Premiums Earned |  |  |
Direct | $ 23,491 | $ 21,959 | $ 20,316
Assumed | 1,167 | 1,000 | 829
Ceded | (1,869) | (1,716) | (1,568)
Earned premiums and fee income | 23,940 | 22,326 | 20,739
Premiums Earned, Net | 22,567 | 21,026 | 19,390
Property and Casualty Insurance Products |  |  |
Premiums Written |  |  |
Direct | 17,622 | 16,144 | 14,891
Assumed | 1,102 | 975 | 718
Ceded | (1,775) | (1,642) | (1,490)
Net | 16,949 | 15,477 | 14,119
Premiums Earned |  |  |
Direct | 16,915 | 15,514 | 14,328
Assumed | 1,001 | 826 | 654
Ceded | (1,742) | (1,612) | (1,462)
Premiums Earned, Net | 16,174 | 14,728 | 13,520
Group Insurance Policy [Member] |  |  |
Premiums Earned |  |  |
Assumed | 166 | 174 | 175
Ceded | (127) | (104) | (106)
Earned premiums and fee income | 6,615 | 6,515 | 6,057
Direct earned premiums, fee income and other considerations | $ 6,576 | $ 6,445 | $ 5,988

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