v3.26.3
Investments - Schedule of Changes in Unrealized Appreciation (Depreciation) of Available for Sale Securities and Other Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Equity Securities, FV-NI, Unrealized Gain (Loss) [Abstract]        
Net gains (losses) recognized during the period on equity securities and other investments $ 36 $ (182) $ (26) $ 586
Less: Net gains (losses) recognized during the period on equity securities and other investments sold during the period 38 (63) (5) (29)
Unrealized gains (losses) recognized during the reporting period on equity securities and other investments still held at the reporting date (2) (119) (21) 615
Continuing Operations, Excluding Held-For-Sale        
Debt Securities, Available-for-sale [Line Items]        
Increase (decrease) in unrealized appreciation (depreciation) of investments (1,989) 543 (2,527) 1,370
Fixed maturity securities | Continuing Operations, Excluding Held-For-Sale        
Debt Securities, Available-for-sale [Line Items]        
Increase (decrease) in unrealized appreciation (depreciation) of investments (1,989) 543 (2,489) 1,370
Other investments | Continuing Operations, Excluding Held-For-Sale        
Debt Securities, Available-for-sale [Line Items]        
Increase (decrease) in unrealized appreciation (depreciation) of investments 0 0 (38) 0
Equities        
Equity Securities, FV-NI, Unrealized Gain (Loss) [Abstract]        
Net gains (losses) recognized during the period on equity securities and other investments (4) 62 87 85
Less: Net gains (losses) recognized during the period on equity securities and other investments sold during the period 29 2 148 3
Unrealized gains (losses) recognized during the reporting period on equity securities and other investments still held at the reporting date (33) 60 (61) 82
Other invested assets        
Equity Securities, FV-NI, Unrealized Gain (Loss) [Abstract]        
Net gains (losses) recognized during the period on equity securities and other investments 40 (244) (113) 501
Less: Net gains (losses) recognized during the period on equity securities and other investments sold during the period 9 (65) (153) (32)
Unrealized gains (losses) recognized during the reporting period on equity securities and other investments still held at the reporting date $ 31 $ (179) $ 40 $ 533