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Reinsurance - Schedule of Short-Duration Insurance Premiums Written and Earned (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Premiums earned: |  |  |
Direct | $ 31,208 | $ 30,781 | $ 32,053
Assumed | 3,947 | 7,050 | 7,137
Ceded | (11,618) | (12,267) | (12,425)
Net | 23,537 | 25,564 | 26,765
Short-Duration Insurance |  |  |
Premiums written: |  |  |
Direct | 31,743 | 31,445 | 32,025
Assumed | 3,950 | 7,951 | 7,385
Ceded | (11,791) | (12,190) | (12,650)
Net | 23,902 | 27,206 | 26,760
Premiums earned: |  |  |
Direct | 31,208 | 30,781 | 32,053
Assumed | 3,947 | 7,050 | 7,137
Ceded | (11,618) | (12,267) | (12,425)
Net | $ 23,537 | $ 25,564 | $ 26,765
Percent of amount assumed to net | 16.80% | 27.60% | 26.70%

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