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Investments - Components of Net Realized Gains (Losses) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Gain (Loss) on Securities [Line Items]        
Gross realized gains on available-for-sale securities $ 7 $ 45 $ 88 $ 51
Gross realized gains on equity securities 12 14 53 26
Subtotal gross realized gains on security sales 19 59 141 77
Gross realized loss on available-for-sale securities (4) (8) (97) (388)
Gross realized loss on equity securities (3) (19) (12) (30)
Subtotal gross realized losses on security sales (7) (27) (109) (418)
Net realized gains (losses) on available-for-sale securities sales 3 37 (9) (337)
Net realized gains (losses) on equity securities sales 9 (5) 41 (4)
Subtotal net realized gains (losses) on security sales 12 32 32 (341)
Gain 0 36 0 36
Hybrid securities 3 20 17 31
Equity securities 280 200 421 591
Subtotal net holding period gains (losses) 283 220 438 622
Total net realized gains (losses) on securities 295 288 470 317
U.S. government obligations        
Gain (Loss) on Securities [Line Items]        
Gross realized gains on available-for-sale securities 1 43 78 44
Gross realized loss on available-for-sale securities 0 (2) (78) (329)
Net realized gains (losses) on available-for-sale securities sales 1 41 0 (285)
State and local government obligations        
Gain (Loss) on Securities [Line Items]        
Gross realized loss on available-for-sale securities 0 (1) (2) (1)
Net realized gains (losses) on available-for-sale securities sales 0 (1) (2) (1)
Corporate and other debt securities        
Gain (Loss) on Securities [Line Items]        
Gross realized gains on available-for-sale securities 6 2 9 6
Gross realized loss on available-for-sale securities (4) (5) (7) (43)
Net realized gains (losses) on available-for-sale securities sales 2 (3) 2 (37)
Commercial mortgage-backed securities        
Gain (Loss) on Securities [Line Items]        
Gross realized loss on available-for-sale securities 0 0 (10) (15)
Net realized gains (losses) on available-for-sale securities sales 0 0 (10) (15)
Nonredeemable preferred stocks        
Gain (Loss) on Securities [Line Items]        
Gross realized gains on equity securities 1 0 3 0
Gross realized loss on equity securities (1) (7) (6) (18)
Net realized gains (losses) on equity securities sales 0 (7) (3) (18)
Common equities        
Gain (Loss) on Securities [Line Items]        
Gross realized gains on equity securities 11 14 50 26
Gross realized loss on equity securities (2) (12) (6) (12)
Net realized gains (losses) on equity securities sales 9 2 44 14
Residential mortgage-backed securities        
Gain (Loss) on Securities [Line Items]        
Gross realized gains on available-for-sale securities 0 0 1 1
Net realized gains (losses) on available-for-sale securities sales $ 0 $ 0 $ 1 $ 1