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Investments - Gross Unrealized losses by Major Security (Detail)
$ in Millions
Sep. 30, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Sep. 30, 2024
USD ($)
security
Number of Securities      
Total | security 676 1,073 903
Less than 12 Months | security 109 342 86
12 Months or Greater | security 567 731 817
Fair Value      
Total $ 20,495 $ 53,784 $ 25,490
Less than 12 Months 3,472 35,528 3,411
12 Months or Greater 17,023 18,256 22,079
Unrealized Losses      
Total (850) (1,935) (1,258)
Less than 12 Months (11) (485) (6)
12 Months or Greater $ (839) $ (1,450) $ (1,252)
U.S. government obligations      
Number of Securities      
Total | security 71 113 86
Less than 12 Months | security 7 39 3
12 Months or Greater | security 64 74 83
Fair Value      
Total $ 11,145 $ 38,782 $ 12,919
Less than 12 Months 1,777 30,257 2,069
12 Months or Greater 9,368 8,525 10,850
Unrealized Losses      
Total (413) (1,151) (574)
Less than 12 Months (3) (418) (3)
12 Months or Greater $ (410) $ (733) $ (571)
State and local government obligations      
Number of Securities      
Total | security 251 379 302
Less than 12 Months | security 40 127 44
12 Months or Greater | security 211 252 258
Fair Value      
Total $ 1,557 $ 2,339 $ 1,779
Less than 12 Months 188 783 208
12 Months or Greater 1,369 1,556 1,571
Unrealized Losses      
Total (65) (117) (90)
Less than 12 Months (1) (6) 0
12 Months or Greater $ (64) $ (111) $ (90)
Foreign government obligations      
Number of Securities      
Total | security     1
Less than 12 Months | security     0
12 Months or Greater | security     1
Fair Value      
Total     $ 16
Less than 12 Months     0
12 Months or Greater     16
Unrealized Losses      
Total     (1)
Less than 12 Months     0
12 Months or Greater     $ (1)
Corporate and other debt securities      
Number of Securities      
Total | security 138 304 224
Less than 12 Months | security 24 122 14
12 Months or Greater | security 114 182 210
Fair Value      
Total $ 3,503 $ 7,034 $ 5,251
Less than 12 Months 718 2,935 426
12 Months or Greater 2,785 4,099 4,825
Unrealized Losses      
Total (86) (215) (156)
Less than 12 Months (4) (33) (3)
12 Months or Greater $ (82) $ (182) $ (153)
Residential mortgage-backed securities      
Number of Securities      
Total | security 28 40 33
Less than 12 Months | security 9 12 4
12 Months or Greater | security 19 28 29
Fair Value      
Total $ 283 $ 428 $ 244
Less than 12 Months 186 377 185
12 Months or Greater 97 51 59
Unrealized Losses      
Total (6) (11) (6)
Less than 12 Months (1) (4) 0
12 Months or Greater $ (5) $ (7) $ (6)
Commercial mortgage-backed securities      
Number of Securities      
Total | security 138 153 177
Less than 12 Months | security 16 8 5
12 Months or Greater | security 122 145 172
Fair Value      
Total $ 2,879 $ 3,294 $ 3,750
Less than 12 Months 375 264 170
12 Months or Greater 2,504 3,030 3,580
Unrealized Losses      
Total (247) (376) (377)
Less than 12 Months (1) (16) 0
12 Months or Greater $ (246) $ (360) $ (377)
Other asset-backed securities      
Number of Securities      
Total | security 50 84 80
Less than 12 Months | security 13 34 16
12 Months or Greater | security 37 50 64
Fair Value      
Total $ 1,128 $ 1,907 $ 1,531
Less than 12 Months 228 912 353
12 Months or Greater 900 995 1,178
Unrealized Losses      
Total (33) (65) (54)
Less than 12 Months (1) (8) 0
12 Months or Greater $ (32) $ (57) $ (54)