v3.26.3
Long-duration Contracts - Balances of and Changes in Liability for Future Policy Benefits (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change [Abstract]        
Effect of foreign exchange on the change in discount rate assumptions   $ (1)    
Issuances   220    
Liability for Future Policy Benefit, before Reinsurance $ 45,166 49,006 $ 50,264  
Present value of expected future policy benefits        
Issuances 450      
Interest accrual 1,411 1,366    
Benefit payments (3,559) (3,406)    
Foreign exchange   244    
Expected future gross premiums, undiscounted   1,102    
Expected future gross premiums, discounted   920    
Payout annuities with life contingencies        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change [Abstract]        
Beginning balance, present value of expected net premiums 0 0    
Effect of changes in discount rate assumptions 0 0 0 $ 0
Effect of foreign exchange on the change in discount rate assumptions 0 0 0 0
Beginning balance at original discount rate 0 0 0 0
Effect of actual to expected experience 0     0
Adjusted balance 0 0    
Issuances 0 0    
Interest accrual 0 0    
Net premium collected 0 0    
Foreign exchange 0 0    
Other   0    
Other   0    
Ending balance, present value of expected net premiums 0 0    
Liability for Future Policy Benefit, before Reinsurance 37,638 41,909    
Present value of expected future policy benefits        
Beginning balance, present value of expected future policy benefits 42,058 42,261    
Effect of changes in discount rate assumptions 8,823 5,849 5,941 7,378
Effect of foreign exchange on the change in discount rate assumptions (14) (20) 21 (5)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 46,475 47,778 48,020 49,634
Effect of actual to expected experience (62) (48)    
Adjusted balance 48,009 49,533    
Issuances 441 205    
Interest accrual 1,286 1,311    
Benefit payments (3,247) (3,329)    
Foreign exchange (14) 58    
Ending balance, present value of expected future policy benefits 37,638 41,909    
Beginning balance at original discount rate 48,020 49,634    
Net future policy benefits 37,638 $ 41,909    
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance $ 0      
Weighted-average liability duration (in years) 9 years 2 months 12 days 9 years 3 months 18 days    
Weighted-average interest accretion rate 3.70% 3.70%    
Weighted-average current discount rate 6.40% 5.20%    
Expected future gross premiums, undiscounted $ 0 $ 0    
Expected future gross premiums, discounted 0 0    
Expected future benefit payments, undiscounted 68,797 69,682    
Effect of changes in cash flow assumptions       0
Effect of changes in cash flow assumptions 51 (53)    
Whole Life Insurance        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change [Abstract]        
Beginning balance, present value of expected net premiums 1,402 880    
Effect of changes in discount rate assumptions (31) 13 (25) (30)
Effect of foreign exchange on the change in discount rate assumptions (1) (1) 1 2
Beginning balance at original discount rate 1,174 847 1,378 852
Effect of actual to expected experience (13) (14)    
Adjusted balance 1,365 892    
Issuances 9 15    
Interest accrual 36 15    
Net premium collected (232) (139)    
Foreign exchange (4) 54    
Other   10    
Other   11    
Ending balance, present value of expected net premiums 1,142 859    
Liability for Future Policy Benefit, before Reinsurance 2,074 1,429    
Present value of expected future policy benefits        
Beginning balance, present value of expected future policy benefits 3,795 2,711    
Effect of changes in discount rate assumptions 1,438 944 1,036 206
Effect of foreign exchange on the change in discount rate assumptions 51 (7) (47) (1)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 4,603 3,239 4,784 2,916
Effect of actual to expected experience 13 (51)    
Adjusted balance 4,797 3,049    
Issuances 9 15    
Interest accrual 125 55    
Benefit payments (312) (77)    
Foreign exchange (16) 186    
Ending balance, present value of expected future policy benefits 3,216 2,288    
Beginning balance at original discount rate 4,784 2,916    
Net future policy benefits 2,068 $ 1,429    
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance $ 6      
Weighted-average liability duration (in years) 19 years 8 months 12 days 23 years    
Weighted-average interest accretion rate 5.20% 5.00%    
Weighted-average current discount rate 7.50% 6.60%    
Expected future gross premiums, undiscounted $ 1,664      
Expected future gross premiums, discounted 1,342      
Expected future benefit payments, undiscounted 11,428 $ 8,136    
Effect of changes in cash flow assumptions       54
Effect of changes in cash flow assumptions 0     184
Payout Annuity and Whole Life Insurance        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change [Abstract]        
Beginning balance, present value of expected net premiums 1,402 880    
Effect of changes in discount rate assumptions (31) 13 (25) (30)
Effect of foreign exchange on the change in discount rate assumptions (1)   1 2
Beginning balance at original discount rate 1,174 847 1,378 852
Effect of actual to expected experience (13) (14)    
Adjusted balance 1,365 892    
Issuances 9 15    
Interest accrual 36 15    
Net premium collected (232) (139)    
Foreign exchange (4) 54    
Other   10    
Other   11    
Ending balance, present value of expected net premiums 1,142 859    
Liability for Future Policy Benefit, before Reinsurance 39,712      
Present value of expected future policy benefits        
Beginning balance, present value of expected future policy benefits 45,853 44,972    
Effect of changes in discount rate assumptions 10,261 6,793 6,977 7,584
Effect of foreign exchange on the change in discount rate assumptions 37 (27) (26) (6)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 51,078 51,017 $ 52,804 52,550
Effect of actual to expected experience (49) (99)    
Adjusted balance 52,806 52,582    
Issuances 450 220    
Interest accrual 1,411 1,366    
Benefit payments (3,559) (3,406)    
Foreign exchange (30) 244    
Ending balance, present value of expected future policy benefits 40,854 44,197    
Beginning balance at original discount rate 52,804 52,550    
Net future policy benefits 39,706 $ 43,338    
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 6      
Effect of changes in cash flow assumptions       54
Effect of changes in cash flow assumptions $ 51     $ 131