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Reinsurance Reinsurance (Written Consolidated Property Casualty Insurance Premiums On Assumed and Ceded Business) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance      
Direct premiums earned $ 8,742 $ 7,801 $ 7,056
Assumed premiums earned 642 569 561
Ceded premiums earned (495) (412) (392)
Incurred loss and loss expenses 5,737 5,274 5,019
Consolidated Property And Casualty Insurance Entity      
SEC Schedule, 12-17, Insurance Companies, Reinsurance      
Direct premiums written 8,994 7,784 7,002
Assumed premiums written 676 597 619
Ceded premiums written (427) (335) (314)
Net written premiums 9,243 8,046 7,307
Direct premiums earned 8,338 7,407 6,677
Assumed premiums earned 642 569 561
Ceded premiums earned (412) (331) (314)
Earned premiums 8,568 7,645 6,924
Direct incurred loss and loss expenses 5,106 4,843 4,495
Assumed incurred loss and loss expenses 355 280 396
Ceded incurred loss and loss expenses (25) (165) (175)
Incurred loss and loss expenses $ 5,436 $ 4,958 $ 4,716