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Reinsurance - Effects of reinsurance (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Premiums Written |  |  |
Direct | $ 10,056 | $ 9,652 | $ 8,542
Assumed | 11,455 | 8,751 | 6,785
Ceded | (5,779) | (4,935) | (4,249)
Net premiums written | 15,732 | 13,468 | 11,078
Premiums Earned |  |  |
Direct | 9,721 | 9,131 | 8,058
Assumed | 10,880 | 7,890 | 5,768
Ceded | (5,501) | (4,581) | (4,147)
Net premiums earned | 15,100 | 12,440 | 9,679
Losses and Loss Adjustment Expenses |  |  |
Direct | 5,676 | 4,739 | 3,991
Assumed | 6,137 | 3,975 | 3,558
Ceded | (3,471) | (2,468) | (2,521)
Net | $ 8,342 | $ 6,246 | $ 5,028

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