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Reinsurance - Effect of Reinsurance on Net Premiums Earned, Claims Incurred and Policyholder Benefits Paid (Details) - USD ($)
$ in Millions
 5 Months Ended 7 Months Ended 12 Months Ended
May 24, 2022
Dec. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Premiums earned:        
Gross amounts, including reinsurance assumed $ 1,282 $ 1,909 $ 6,343 $ 4,907
Reinsurance ceded (403) (649) (824) (1,386)
Net premiums earned 979 1,454 5,519 3,521
Other policy revenue:        
Gross amounts, including reinsurance assumed 159 226 779 414
Reinsurance ceded 0 0 (122) 0
Net other policy revenue 159 226 657 414
Policyholder benefits paid and claims incurred:        
Gross amounts, including reinsurance assumed 1,089 1,564 7,821 4,103
Reinsurance ceded (258) (374) (2,460) (814)
Net benefits paid and claims incurred 831 1,190 5,361 3,289
Change in fair value of market risk benefits:        
Gross amounts, including reinsurance assumed 0 (102) 92 (69)
Reinsurance ceded 0 0 (95) 0
Net change in fair value of market risk benefits 0 (102) (3) (69)
Interest sensitive contract benefits:        
Gross amounts, including reinsurance assumed 150 217 2,184 480
Reinsurance ceded 0 0 (439) 0
Net interest sensitive contract benefits 150 217 $ 1,745 480
American National, Historical        
Premiums earned:        
Reinsurance ceded (303) (455)    
Policyholder benefits paid and claims incurred:        
Net benefits paid and claims incurred   1,188   3,261
Interest sensitive contract benefits:        
Net interest sensitive contract benefits $ 0 $ 0   $ 0