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Policyholder Account Balances, Future Policy Benefits and Claims - Balance of and Changes in Policyholder Account Balances (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Policyholder Account Balance [Roll Forward]    
Beginning balance $ 27,947 $ 24,986
Contract deposits 4,832 3,884
Policy charges (407) (401)
Surrenders and other benefits (2,266) (2,382)
Net transfer from (to) separate account liabilities (177) (132)
Other variable account adjustments 1,968 1,403
Interest credited 645 589
Ending balance 32,542 27,947
Variable Annuities    
Policyholder Account Balance [Roll Forward]    
Beginning balance 4,173 4,752
Contract deposits 56 73
Policy charges (14) (10)
Surrenders and other benefits (628) (759)
Net transfer from (to) separate account liabilities (32) (25)
Other variable account adjustments 0 0
Interest credited 125 142
Ending balance $ 3,680 $ 4,173
Weighted-average crediting rate 3.30% 3.30%
Cash surrender value $ 3,658 $ 4,146
Structured Variable Annuities    
Policyholder Account Balance [Roll Forward]    
Beginning balance 10,742 6,410
Contract deposits 4,005 3,084
Policy charges (3) 0
Surrenders and other benefits (383) (156)
Net transfer from (to) separate account liabilities 0 0
Other variable account adjustments 1,968 1,403
Interest credited 1 1
Ending balance $ 16,330 $ 10,742
Weighted-average crediting rate 1.90% 1.80%
Cash surrender value $ 15,467 $ 10,129
Fixed Annuities    
Policyholder Account Balance [Roll Forward]    
Beginning balance 5,982 6,799
Contract deposits 39 47
Policy charges 0 0
Surrenders and other benefits (856) (1,086)
Net transfer from (to) separate account liabilities 0 0
Other variable account adjustments 0 0
Interest credited 204 222
Ending balance $ 5,369 $ 5,982
Weighted-average crediting rate 3.70% 3.60%
Cash surrender value $ 5,365 $ 5,974
Fixed Indexed Annuities    
Policyholder Account Balance [Roll Forward]    
Beginning balance 307 312
Contract deposits 0 0
Policy charges 0 0
Surrenders and other benefits (16) (10)
Net transfer from (to) separate account liabilities 0 0
Other variable account adjustments 0 0
Interest credited 14 5
Ending balance $ 305 $ 307
Weighted-average crediting rate 2.00% 2.00%
Cash surrender value $ 279 $ 278
Non-Life Contingent Payout Annuities    
Policyholder Account Balance [Roll Forward]    
Beginning balance 444 471
Contract deposits 101 91
Policy charges 0 0
Surrenders and other benefits (110) (127)
Net transfer from (to) separate account liabilities 0 0
Other variable account adjustments 0 0
Interest credited 12 9
Ending balance 447 444
Universal Life Insurance    
Policyholder Account Balance [Roll Forward]    
Beginning balance 1,474 1,544
Contract deposits 117 123
Policy charges (173) (176)
Surrenders and other benefits (62) (69)
Net transfer from (to) separate account liabilities 0 0
Other variable account adjustments 0 0
Interest credited 49 52
Ending balance $ 1,405 $ 1,474
Weighted-average crediting rate 3.60% 3.60%
Net amount at risk $ 8,312 $ 8,740
Cash surrender value 1,280 1,330
Variable Universal Life Insurance    
Policyholder Account Balance [Roll Forward]    
Beginning balance 1,569 1,520
Contract deposits 333 272
Policy charges (93) (94)
Surrenders and other benefits (80) (78)
Net transfer from (to) separate account liabilities (145) (107)
Other variable account adjustments 0 0
Interest credited 63 56
Ending balance $ 1,647 $ 1,569
Weighted-average crediting rate 3.90% 3.90%
Net amount at risk $ 57,473 $ 57,291
Cash surrender value 1,092 1,065
Indexed Universal Life Insurance    
Policyholder Account Balance [Roll Forward]    
Beginning balance 2,755 2,654
Contract deposits 181 193
Policy charges (124) (121)
Surrenders and other benefits (79) (53)
Net transfer from (to) separate account liabilities 0 0
Other variable account adjustments 0 0
Interest credited 161 82
Ending balance $ 2,894 $ 2,755
Weighted-average crediting rate 2.30% 2.00%
Net amount at risk $ 13,593 $ 14,407
Cash surrender value 2,447 2,271
Other Life Insurance, Netting    
Policyholder Account Balance [Roll Forward]    
Beginning balance 501 524
Contract deposits 0 1
Policy charges 0 0
Surrenders and other benefits (52) (44)
Net transfer from (to) separate account liabilities 0 0
Other variable account adjustments 0 0
Interest credited 16 20
Ending balance $ 465 $ 501
Weighted-average crediting rate 4.00% 4.00%
Net amount at risk $ 130 $ 141
Cash surrender value $ 298 $ 326