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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Premiums earned:        
Gross amounts, including reinsurance assumed $ 943 $ 1,387 $ 1,988 $ 2,871
Reinsurance ceded (191) (382) (347) (722)
Net amount 752 1,005 1,641 2,149
Other policy revenue:        
Gross amounts, including reinsurance assumed 252 203 480 315
Reinsurance ceded (80) (19) (159) (19)
Net amount 172 184 321 296
Policyholder benefits and claims incurred:        
Gross amounts, including reinsurance assumed 1,074 1,296 2,158 2,588
Reinsurance ceded (246) (266) (442) (472)
Net amount 828 1,030 1,716 2,116
Change in fair value of market risk benefits:        
Gross amounts, including reinsurance assumed (26) 148 366 186
Reinsurance ceded (21) (9) (52) (28)
Net amount (47) 139 314 158
Interest sensitive contract benefits:        
Gross amounts, including reinsurance assumed 544 506 1,094 765
Reinsurance ceded (59) (116) (97) (220)
Net amount $ 485 $ 390 $ 997 $ 545