v3.25.3
Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss) (Details) - Reclassifications - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss)        
Reclassification adjustment impacting net realized investment gains (losses) on the consolidated statement of income $ (27) $ (55) $ 28 $ (25)
Reclassification adjustment impacting claims and claim adjustment expenses (benefit) on the consolidated statement of income 6,594 6,996 21,389 21,025
Reclassification adjustment impacting general and administrative expenses (benefit) on the consolidated statement of income 1,572 1,460 4,576 4,344
Total reclassifications (2,344) (1,560) (4,693) (3,586)
Income tax (expense) benefit (456) (300) (901) (669)
Amounts reclassified from accumulated other comprehensive income (loss), net of taxes (1,888) (1,260) (3,792) (2,917)
Accumulated Other Comprehensive Income (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss)        
Total reclassifications 2 16 50 88
Income tax (expense) benefit 0 2 10 18
Amounts reclassified from accumulated other comprehensive income (loss), net of taxes 2 14 40 70
Changes in Net Unrealized Gains (Losses) on Investment Securities Having No Credit Losses Recognized in the Consolidated Statement of Income [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss)        
Reclassification adjustment impacting net realized investment gains (losses) on the consolidated statement of income 2 17 50 92
Income tax (expense) benefit 0 3 10 19
Amounts reclassified from accumulated other comprehensive income (loss), net of taxes 2 14 40 73
Changes in Net Unrealized Gains (Losses) on Investment Securities Having Credit Losses Recognized in the Consolidated Statement of Income [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss)        
Reclassification adjustment impacting net realized investment gains (losses) on the consolidated statement of income 0 0 0 0
Income tax (expense) benefit 0 0 0 0
Amounts reclassified from accumulated other comprehensive income (loss), net of taxes 0 0 0 0
Net Benefit Plan Assets and Obligations Recognized in Shareholders' Equity [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss)        
Reclassification adjustment impacting claims and claim adjustment expenses (benefit) on the consolidated statement of income 0 0 0 (1)
Reclassification adjustment impacting general and administrative expenses (benefit) on the consolidated statement of income 0 (1) 0 (3)
Total reclassifications 0 (1) 0 (4)
Income tax (expense) benefit 0 (1) 0 (1)
Amounts reclassified from accumulated other comprehensive income (loss), net of taxes 0 0 0 (3)
Net Unrealized Foreign Currency Translation [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss)        
Reclassification adjustment impacting net realized investment gains (losses) on the consolidated statement of income 0 0 0 0
Income tax (expense) benefit 0 0 0 0
Amounts reclassified from accumulated other comprehensive income (loss), net of taxes $ 0 $ 0 $ 0 $ 0