v3.26.1
Long-duration Contracts - Balances of and Changes in Liability for Future Policy Benefits (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change [Abstract]        
Liability for Future Policy Benefit, before Reinsurance $ 48,241 $ 49,400 $ 50,264  
Present value of expected future policy benefits        
Issuances 280 133    
Interest accrual 945 914    
Benefit payments (2,360) (2,287)    
Foreign exchange   345    
Expected future gross premiums, undiscounted   1,064    
Expected future gross premiums, discounted   919    
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
Effect of foreign exchange on the change in discount rate assumptions 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      
Interest accrual 0 0    
Net premium collected 0 0    
Foreign exchange 0 0    
Ending balance, present value of expected net premiums 0 0    
Liability for Future Policy Benefit, before Reinsurance 40,388 41,926    
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 6,531 6,465 5,941 7,378
Effect of foreign exchange on the change in discount rate assumptions (15) (28) 21 (5)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 46,934 48,419 48,020 49,634
Effect of actual to expected experience (49) (64)    
Adjusted balance 47,971 49,570    
Issuances 273      
Interest accrual 861 879    
Benefit payments (2,158) (2,238)    
Foreign exchange (13) 75    
Ending balance, present value of expected future policy benefits 40,388 41,926    
Beginning balance at original discount rate 48,020 49,634    
Net future policy benefits 40,388 $ 41,926    
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance $ 0      
Weighted-average liability duration (in years) 9 years 2 months 12 days 9 years 4 months 24 days    
Weighted-average interest accretion rate 3.70% 3.70%    
Weighted-average current discount rate 5.50% 5.30%    
Expected future gross premiums, undiscounted $ 0 $ 0    
Expected future gross premiums, discounted 0 0    
Expected future benefit payments, undiscounted 69,045 70,754    
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   23 (25) (30)
Effect of foreign exchange on the change in discount rate assumptions (1)   1 2
Beginning balance at original discount rate 1,216 845 1,378 852
Effect of actual to expected experience (8) (1)    
Adjusted balance 1,370 851    
Issuances 7      
Interest accrual 25 10    
Net premium collected (161) (92)    
Foreign exchange (25) 76    
Ending balance, present value of expected net premiums 1,215 868    
Liability for Future Policy Benefit, before Reinsurance 2,288 1,729    
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 1,181 553 1,036 206
Effect of foreign exchange on the change in discount rate assumptions 87 (24) (47) (1)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 4,597 3,174 4,784 2,916
Effect of actual to expected experience 34 2    
Adjusted balance 4,818 2,918    
Issuances 7 0    
Interest accrual 84 35    
Benefit payments (202) (49)    
Foreign exchange (110) 270    
Ending balance, present value of expected future policy benefits 3,503 2,597    
Beginning balance at original discount rate 4,784 2,916    
Net future policy benefits 2,283 $ 1,729    
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance $ 5      
Weighted-average liability duration (in years) 19 years 6 months 29 years 4 months 24 days    
Weighted-average interest accretion rate 5.20% 4.80%    
Weighted-average current discount rate 6.50% 5.10%    
Expected future gross premiums, undiscounted $ 1,715      
Expected future gross premiums, discounted 1,380      
Expected future benefit payments, undiscounted 10,554 $ 10,085    
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   23 (25) (30)
Effect of foreign exchange on the change in discount rate assumptions (1)   1 2
Beginning balance at original discount rate 1,216 845 1,378 852
Effect of actual to expected experience (8) (1)    
Adjusted balance 1,370 851    
Issuances 7      
Interest accrual 25 10    
Net premium collected (161) (92)    
Foreign exchange (25) 76    
Ending balance, present value of expected net premiums 1,215 868    
Liability for Future Policy Benefit, before Reinsurance 42,676      
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 7,712 7,018 6,977 7,584
Effect of foreign exchange on the change in discount rate assumptions 72 (52) (26) (6)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 51,531 51,593 $ 52,804 $ 52,550
Effect of actual to expected experience (15) (62)    
Adjusted balance 52,789 52,488    
Issuances 280 133    
Interest accrual 945 914    
Benefit payments (2,360) (2,287)    
Foreign exchange (123) 345    
Ending balance, present value of expected future policy benefits 43,891 44,523    
Beginning balance at original discount rate 52,804 52,550    
Net future policy benefits 42,671 $ 43,655    
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance $ 5