v3.26.3
Insurance Liabilities - Liability for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 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 $ 69,852 $ 69,754 $ 70,666 $ 69,168
Reinsurance recoverable (27,858) (27,866) (28,871) (29,026)
Net Liability for unpaid loss and loss adjustment expenses, beginning of period 41,994 41,888 41,795 40,142
Losses and loss adjustment expenses incurred:        
Current year 4,018 3,572 11,458 10,904
Prior years, excluding discount and amortization of deferred gain (70) (161) (442) (169)
Prior years, discount charge (benefit) 113 34 131 119
Prior years, amortization of deferred gain on retroactive reinsurance (38) (54) (65) (176)
Total losses and loss adjustment expenses incurred 4,023 3,391 11,082 10,678
Losses and loss adjustment expenses paid:        
Current year (1,020) (1,262) (2,385) (2,714)
Prior years (2,108) (2,371) (7,357) (7,901)
Total losses and loss adjustment expenses paid (3,128) (3,633) (9,742) (10,615)
Other changes:        
Foreign exchange effect 29 (102) (191) 1,277
Losses and loss adjustment expenses recognized within net (gain) loss on divestitures (2) 13 (3) 60
Retroactive reinsurance adjustment (net of discount) (9) 77 107 92
Other, net of reinsurance recoverables 8 0 (133) 0
Total other changes 26 (12) (220) 1,429
Net liability for unpaid losses and loss adjustment expenses 42,915 41,634 42,915 41,634
Reinsurance recoverable 27,267 28,248 27,267 28,248
Total 70,182 69,882 70,182 69,882
Change in discount on loss reserves ceded under retroactive reinsurance 54 7 126 27
National Indemnity Company        
Losses and loss adjustment expenses incurred:        
Prior years, amortization of deferred gain on retroactive reinsurance $ 8 $ 14 $ 31 $ 26