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Reinsurance (Premiums Written And Earned And Incurred Losses And LAE) (Details) - USD ($)
$ in Millions
 12 Months Ended
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