v3.26.1
Insurance Liabilities - Liability for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Reconciliation of activity in the Liability for unpaid claims and claims adjustment expense:        
Liability for unpaid loss and loss adjustment expenses, beginning of period $ 69,963 $ 68,896 $ 70,666 $ 69,168
Reinsurance recoverable (28,198) (27,799) (28,871) (29,026)
Net Liability for unpaid loss and loss adjustment expenses, beginning of period 41,765 41,097 41,795 40,142
Losses and loss adjustment expenses incurred:        
Current year 3,779 3,523 7,440 7,332
Prior years, excluding discount and amortization of deferred gain (246) 25 (372) (8)
Prior years, discount charge (benefit) 43 45 18 85
Prior years, amortization of deferred gain on retroactive reinsurance 8 (100) (27) (122)
Total losses and loss adjustment expenses incurred 3,584 3,493 7,059 7,287
Losses and loss adjustment expenses paid:        
Current year (885) (1,023) (1,365) (1,452)
Prior years (2,396) (2,569) (5,249) (5,530)
Total losses and loss adjustment expenses paid (3,281) (3,592) (6,614) (6,982)
Other changes:        
Foreign exchange effect (26) 895 (220) 1,379
Losses and loss adjustment expenses recognized within net (gain) loss on divestitures (5) 15 (1) 47
Retroactive reinsurance adjustment (net of discount) 98 (20) 116 15
Other, net of reinsurance recoverables (141) 0 (141) 0
Total other changes (74) 890 (246) 1,441
Net liability for unpaid losses and loss adjustment expenses 41,994 41,888 41,994 41,888
Reinsurance recoverable 27,858 27,866 27,858 27,866
Total 69,852 69,754 69,852 69,754
Change in discount on loss reserves ceded under retroactive reinsurance 19 19 72 20
National Indemnity Company        
Losses and loss adjustment expenses incurred:        
Prior years, amortization of deferred gain on retroactive reinsurance $ 8 $ 7 $ 23 $ 12