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Reserve for Property and Casualty Insurance Claims and Claims Expense - Schedule of Rollforward of Reserve for Property and Casualty Insurance Claims and Claims Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Activity in the reserve for property-liability insurance claims and claims expense:      
Beginning balance $ 41,917    
Incurred claims and claims expense related to:      
Prior years (1,809) $ (308) $ 549
Claims and claims expense paid related to:      
Ending balance 41,079 41,917  
Property and casualty      
Activity in the reserve for property-liability insurance claims and claims expense:      
Beginning balance 41,917 39,858 37,541
Less recoverables (8,602) (8,396) (9,176)
Net balance, beginning 33,315 31,462 28,365
Incurred claims and claims expense related to:      
Current year 39,263 40,043 40,521
Prior years (1,809) (308) 549
Total incurred 37,454 39,735 41,070
Claims and claims expense paid related to:      
Current year (23,173) (23,488) (23,607)
Prior years (14,529) (14,394) (14,366)
Total paid (37,702) (37,882) (37,973)
Net balance, ending 33,067 33,315 31,462
Plus recoverables (8,012) (8,602) (8,396)
Ending balance $ 41,079 $ 41,917 $ 39,858