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Reinsurance and Indemnification - Schedule of Effects of Reinsurance and Indemnification on Property and Casualty Premiums Written and Earned and Accident and Health Insurance Premiums and Contract Charges (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Property and casualty insurance premiums earned      
Direct $ 63,699 $ 60,166 $ 54,166
Assumed 431 403 386
Ceded (2,681) (2,260) (2,036)
Net amount 61,449 58,309 52,516
Property and casualty insurance premiums      
Property and casualty insurance premiums written      
Direct 64,596 60,574 54,632
Assumed 385 352 396
Ceded (2,429) (2,203) (2,018)
Property and casualty insurance premiums written, net of recoverables 62,552 58,723 53,010
Property and casualty insurance premiums earned      
Direct 62,511 58,221 52,301
Assumed 389 377 358
Ceded (2,397) (2,210) (1,989)
Net amount 60,503 56,388 50,670
Accident and health insurance      
Property and casualty insurance premiums earned      
Direct 1,188 1,687 1,639
Assumed 42 10 12
Ceded (284) (45) (41)
Net amount 946 1,652 1,610
Accident and health insurance premiums and contract charges      
Direct 1,188 1,945 1,865
Assumed 42 26 28
Ceded (284) (50) (47)
Accident and health insurance premiums and contract charges, net of recoverables $ 946 $ 1,921 $ 1,846