v3.25.3
Long-duration Contracts - Schedule of Rollforward by Product Within Future Policy Benefits (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Present value of expected future policy benefits        
Net future policy benefits $ 49,006 $ 52,962    
Total        
Present value of expected net premiums        
Beginning balance 880 1,182    
Effect of changes in discount rate assumptions, beginning balance (30) (45)    
Effect of foreign exchange on the change in discount rate assumptions, beginning balance 2 (2)    
Beginning balance at original discount rate 852 1,135    
Effect of changes in cash flow assumptions     $ 54  
Effect of actual to expected experience     (14) $ (4)
Adjusted balance     892 1,131
Issuances 15      
Interest accrual 15 17    
Net premium collected (139) (144)    
Foreign exchange 54 (28)    
Other 10      
Ending balance at original discount rate 847 976 852 1,135
Effect of changes in discount rate assumptions, ending balance (13) (41)    
Effect of foreign exchange on the change in discount rate assumptions, ending balance 1 (1)    
Ending balance, present value of expected net premiums 859 1,018    
Present value of expected future policy benefits        
Beginning balance 44,972 48,372    
Effect of changes in discount rate assumptions 7,584 6,144    
Effect of foreign exchange on the change in discount rate assumptions (6) (5)    
Beginning balance at original discount rate 52,550 54,511    
Effect of changes in cash flow assumptions 131 (104)   (104)
Effect of actual to expected experience (99)     (93)
Adjusted balance 52,582     54,314
Issuances 220 1,010    
Interest accrual 1,366 1,405    
Benefit payments (3,406) (3,421)    
Foreign exchange 244 (31)    
Other 11      
Ending balance at original discount rate 51,017 53,277    
Effect of changes in discount rate assumptions 6,793 5,316    
Effect of foreign exchange on the change in discount rate assumptions 27 19    
Ending balance, present value of expected future policy benefits 44,197 47,942    
Less: Present value of expected net premiums 859 1,018 880 1,182
Net future policy benefits 43,338 46,924    
Payout Annuities with Life Contingencies        
Present value of expected net premiums        
Beginning balance 0 0    
Effect of changes in discount rate assumptions, beginning balance 0 0    
Effect of foreign exchange on the change in discount rate assumptions, beginning balance 0 0    
Beginning balance at original discount rate 0 0    
Effect of changes in cash flow assumptions     0  
Effect of actual to expected experience     0 0
Adjusted balance     0 0
Issuances 0      
Interest accrual 0 0    
Net premium collected 0 0    
Foreign exchange 0 0    
Other 0      
Ending balance at original discount rate 0 0 0 0
Effect of changes in discount rate assumptions, ending balance 0 0    
Effect of foreign exchange on the change in discount rate assumptions, ending balance 0 0    
Ending balance, present value of expected net premiums 0 0    
Present value of expected future policy benefits        
Beginning balance 42,261 45,001    
Effect of changes in discount rate assumptions 7,378 6,233    
Effect of foreign exchange on the change in discount rate assumptions (5) 1    
Beginning balance at original discount rate 49,634 51,235    
Effect of changes in cash flow assumptions (53)     (104)
Effect of actual to expected experience (48)     (89)
Adjusted balance 49,533     51,042
Issuances 205 1,010    
Interest accrual 1,311 1,353    
Benefit payments (3,329) (3,355)    
Foreign exchange 58 33    
Other 0      
Ending balance at original discount rate 47,778 50,083    
Effect of changes in discount rate assumptions 5,849 5,362    
Effect of foreign exchange on the change in discount rate assumptions 20 16    
Ending balance, present value of expected future policy benefits 41,909 44,705    
Less: Present value of expected net premiums 0 0 0 0
Net future policy benefits $ 41,909 $ 44,705    
Liability for Future Policy Benefit, after Reinsurance [Abstract]        
Weighted-average liability duration (in years) 9 years 3 months 18 days 9 years 4 months 24 days    
Weighted-average interest accretion rate 3.70% 3.70%    
Weighted-average current discount rate 5.20% 5.00%    
Expected future gross premiums, undiscounted $ 0 $ 0    
Expected future gross premiums, discounted 0 0    
Expected future benefit payments, undiscounted 69,682 73,523    
Whole Life        
Present value of expected net premiums        
Beginning balance 880 1,182    
Effect of changes in discount rate assumptions, beginning balance (30) (45)    
Effect of foreign exchange on the change in discount rate assumptions, beginning balance 2 (2)    
Beginning balance at original discount rate 852 1,135    
Effect of changes in cash flow assumptions     54  
Effect of actual to expected experience     (14) (4)
Adjusted balance     892 1,131
Issuances 15      
Interest accrual 15 17    
Net premium collected (139) (144)    
Foreign exchange 54 (28)    
Other 10      
Ending balance at original discount rate 847 976 852 1,135
Effect of changes in discount rate assumptions, ending balance (13) (41)    
Effect of foreign exchange on the change in discount rate assumptions, ending balance 1 (1)    
Ending balance, present value of expected net premiums 859 1,018    
Present value of expected future policy benefits        
Beginning balance 2,711 3,371    
Effect of changes in discount rate assumptions 206 (89)    
Effect of foreign exchange on the change in discount rate assumptions (1) (6)    
Beginning balance at original discount rate 2,916 3,276    
Effect of changes in cash flow assumptions 184     0
Effect of actual to expected experience (51)     (4)
Adjusted balance 3,049     3,272
Issuances 15 0    
Interest accrual 55 52    
Benefit payments (77) (66)    
Foreign exchange 186 (64)    
Other 11      
Ending balance at original discount rate 3,239 3,194    
Effect of changes in discount rate assumptions 944 (46)    
Effect of foreign exchange on the change in discount rate assumptions 7 3    
Ending balance, present value of expected future policy benefits 2,288 3,237    
Less: Present value of expected net premiums 859 1,018 $ 880 $ 1,182
Net future policy benefits $ 1,429 $ 2,219    
Liability for Future Policy Benefit, after Reinsurance [Abstract]        
Weighted-average liability duration (in years) 23 years 31 years 3 months 18 days    
Weighted-average interest accretion rate 5.00% 4.80%    
Weighted-average current discount rate 6.60% 4.00%    
Expected future gross premiums, undiscounted $ 1,102 $ 1,255    
Expected future gross premiums, discounted 920 1,064    
Expected future benefit payments, undiscounted $ 8,136 $ 10,235