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Reinsurance (Premiums Written And Earned And Incurred Losses And LAE) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Reinsurance [Abstract] |  |  |
Written premiums: Direct | $ 4,602 | $ 3,988 | $ 3,218
Written premiums: Assumed | 9,350 | 9,062 | 7,264
Written premiums: Ceded | (1,608) | (1,604) | (1,365)
Net written premiums | 12,344 | 11,446 | 9,117
Premiums earned: Direct | 4,218 | 3,589 | 3,028
Premiums earned: Assumed | 9,082 | 8,315 | 7,055
Premiums earned: Ceded | (1,513) | (1,498) | (1,401)
Net premiums earned | 11,787 | 10,406 | 8,682
Incurred losses and LAE: Direct | 2,804 | 2,385 | 2,141
Incurred losses and LAE: Assumed | 6,285 | 5,741 | 5,164
Incurred losses and LAE: Ceded | (988) | (735) | (754)
Net incurred losses and LAE | $ 8,100 | $ 7,391 | $ 6,551

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