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Contracts Accounted for as Insurance - BIG Transaction Loss Summary (Details)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
risk
Dec. 31, 2024
USD ($)
risk
Discount    
Total $ (27)  
BIG    
Number of risks    
Total (in contracts) | risk 197 207
Principal    
Total $ 11,349 $ 10,150
BIG | BIG 1    
Number of risks    
Total (in contracts) | risk 92 98
Principal    
Total $ 7,226 $ 8,074
BIG | BIG 2    
Number of risks    
Total (in contracts) | risk 10 12
Principal    
Total $ 2,893 $ 702
BIG | BIG 3    
Number of risks    
Total (in contracts) | risk 95 97
Principal    
Total $ 1,230 $ 1,374
BIG | Consolidated Entity Excluding Variable Interest Entities (VIE)    
Number of risks    
Total (in contracts) | risk 197 207
Remaining weighted average contract period    
Gross (in years) 17 years 2 months 12 days 16 years 7 months 6 days
Total (in years) 17 years 2 months 12 days 16 years 7 months 6 days
Principal    
Gross $ 11,361 $ 10,164
Total 11,349 10,150
Interest    
Gross 9,847 8,338
Total 9,845 8,335
Total net outstanding exposure    
Gross 21,208 18,502
Total 21,194 18,485
Expected cash outflows (inflows)    
Gross 4,020 5,665
Total 4,012 5,656
Potential recoveries    
Gross (3,904) (5,626)
Total (3,894) (5,616)
Subtotal    
Gross 116 39
Total 118 40
Discount    
Gross (27) 49
Total (27) 49
Expected losses to be paid (recovered)    
Gross 89 88
Net expected loss to be paid 91 89
Deferred premium revenue    
Gross 545 498
Total 545 498
Reserves (salvage)    
Gross (146) (129)
Total $ (143) $ (128)
BIG | Consolidated Entity Excluding Variable Interest Entities (VIE) | BIG 1    
Number of risks    
Total (in contracts) | risk 92 98
Remaining weighted average contract period    
Gross (in years) 12 years 9 months 18 days 18 years 7 months 6 days
Principal    
Gross $ 7,232 $ 8,080
Interest    
Gross 5,051 7,546
Total net outstanding exposure    
Gross 12,283 15,626
Expected cash outflows (inflows)    
Gross 398 4,016
Potential recoveries    
Gross (659) (4,201)
Subtotal    
Gross (261) (185)
Discount    
Gross 92 43
Expected losses to be paid (recovered)    
Gross (169) (142)
Deferred premium revenue    
Gross 331 333
Reserves (salvage)    
Gross $ (249) $ (226)
BIG | Consolidated Entity Excluding Variable Interest Entities (VIE) | BIG 2    
Number of risks    
Total (in contracts) | risk 10 12
Remaining weighted average contract period    
Gross (in years) 26 years 6 months 8 years 9 months 18 days
Principal    
Gross $ 2,893 $ 702
Interest    
Gross 4,459 371
Total net outstanding exposure    
Gross 7,352 1,073
Expected cash outflows (inflows)    
Gross 2,378 342
Potential recoveries    
Gross (2,134) (293)
Subtotal    
Gross 244 49
Discount    
Gross (107) 29
Expected losses to be paid (recovered)    
Gross 137 78
Deferred premium revenue    
Gross 106 49
Reserves (salvage)    
Gross $ 67 $ 35
BIG | Consolidated Entity Excluding Variable Interest Entities (VIE) | BIG 3    
Number of risks    
Total (in contracts) | risk 95 97
Remaining weighted average contract period    
Gross (in years) 5 years 7 months 6 days 6 years 1 month 6 days
Principal    
Gross $ 1,236 $ 1,382
Interest    
Gross 337 421
Total net outstanding exposure    
Gross 1,573 1,803
Expected cash outflows (inflows)    
Gross 1,244 1,307
Potential recoveries    
Gross (1,111) (1,132)
Subtotal    
Gross 133 175
Discount    
Gross (12) (23)
Expected losses to be paid (recovered)    
Gross 121 152
Deferred premium revenue    
Gross 108 116
Reserves (salvage)    
Gross $ 36 $ 62