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Reinsurance - Effects of reinsurance (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Premiums Written |  |  |
Direct | $ 9,652 | $ 8,542 | $ 7,707
Assumed | 8,751 | 6,785 | 5,045
Ceded | (4,935) | (4,249) | (3,735)
Net premiums written | 13,468 | 11,078 | 9,017
Premiums Earned |  |  |
Direct | 9,131 | 8,058 | 7,150
Assumed | 7,890 | 5,768 | 4,334
Ceded | (4,581) | (4,147) | (3,402)
Net premiums earned | 12,440 | 9,679 | 8,082
Losses and Loss Adjustment Expenses |  |  |
Direct | 4,739 | 3,991 | 4,267
Assumed | 3,975 | 3,558 | 2,826
Ceded | (2,468) | (2,521) | (2,508)
Net | $ 6,246 | $ 5,028 | $ 4,585

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