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Reinsurance - Effect of Reinsurance on Net Premiums Earned, Claims Incurred and Policyholder Benefits Paid (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Premiums earned:        
Gross amounts, including reinsurance assumed $ 725 $ 1,253 $ 2,713 $ 4,124
Reinsurance ceded (159) (365) (506) (1,087)
Net amount 566 888 2,207 3,037
Other policy revenue:        
Gross amounts, including reinsurance assumed 263 212 743 527
Reinsurance ceded (82) (4) (241) (23)
Net amount 181 208 502 504
Policyholder benefits and claims incurred:        
Gross amounts, including reinsurance assumed 715 1,183 2,873 3,771
Reinsurance ceded (188) (337) (630) (809)
Net amount 527 846 2,243 2,962
Change in fair value of market risk benefits:        
Gross amounts, including reinsurance assumed 328 110 694 296
Reinsurance ceded (18) 24 (70) (4)
Net amount 310 134 624 292
Interest sensitive contract benefits:        
Gross amounts, including reinsurance assumed 585 629 1,679 1,394
Reinsurance ceded (62) (106) (159) (326)
Net amount $ 523 $ 523 $ 1,520 $ 1,068