v3.26.3
Future Policy Benefits - Schedule of liabilities by product (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Movement in Liability for Future Policy Benefits [Roll Forward]        
Balance, beginning of year $ 60,971      
Effect of changes in experience     $ (35) $ (24)
Adjusted beginning of year balance     9,443 9,815
Interest accrual 274 $ 291    
Other 3 3    
Net liability for future policy benefits, end of period 55,958 59,279    
Less: Reinsurance recoverable (18,942) (21,185)    
Net liability for future policy benefits after reinsurance recoverable 37,016 38,094    
Universal Life        
Movement in Liability for Future Policy Benefits [Roll Forward]        
Balance, beginning of year 4,295 4,088    
Effect of changes in assumptions     138 54
Effect of changes in experience     263 313
Adjusted beginning of year balance     4,696 4,455
Assessments 496 494    
Excess benefits paid (743) (843)    
Interest accrual 130 123    
Other (7) (9)    
Changes related to unrealized appreciation (depreciation) of investments (233) 103    
Net liability for future policy benefits, end of period 4,339 4,323    
Less: Reinsurance recoverable (257) (218)    
Net liability for future policy benefits after reinsurance recoverable 4,082 4,105    
Life Insurance        
Movement in Liability for Future Policy Benefits [Roll Forward]        
Effect of changes in experience     (25) (24)
Adjusted beginning of year balance     8,594 8,891
Interest accrual 248 262    
Other 3 3    
Net liability for future policy benefits, end of period 12,636 13,677    
Less: Reinsurance recoverable (644) (665)    
Net liability for future policy benefits after reinsurance recoverable $ 11,992 $ 13,012    
Weighted average liability duration of the liability for future policy benefits (in years) 10 years 2 months 12 days 10 years 7 months 6 days    
Life Insurance | Universal Life        
Movement in Liability for Future Policy Benefits [Roll Forward]        
Balance, beginning of year $ 4,241 $ 4,034    
Effect of changes in assumptions     138 54
Effect of changes in experience     267 315
Adjusted beginning of year balance     4,646 4,403
Assessments 496 494    
Excess benefits paid (743) (843)    
Interest accrual 128 121    
Other (7) (9)    
Changes related to unrealized appreciation (depreciation) of investments (233) 103    
Net liability for future policy benefits, end of period 4,287 4,269    
Less: Reinsurance recoverable (205) (164)    
Net liability for future policy benefits after reinsurance recoverable $ 4,082 $ 4,105    
Weighted average liability duration of the liability for future policy benefits (in years) 23 years 4 months 24 days 25 years 7 months 6 days    
Corporate & Other        
Movement in Liability for Future Policy Benefits [Roll Forward]        
Effect of changes in experience     (10) 0
Adjusted beginning of year balance     849 924
Interest accrual $ 26 $ 29    
Other 0 0    
Net liability for future policy benefits, end of period 18,229 20,469    
Less: Reinsurance recoverable (18,229) (20,469)    
Net liability for future policy benefits after reinsurance recoverable $ 0 $ 0    
Weighted average liability duration of the liability for future policy benefits (in years) 9 years 7 months 6 days 10 years 7 months 6 days    
Corporate & Other | Universal Life        
Movement in Liability for Future Policy Benefits [Roll Forward]        
Balance, beginning of year $ 54 $ 54    
Effect of changes in assumptions     0 0
Effect of changes in experience     (4) (2)
Adjusted beginning of year balance     $ 50 $ 52
Assessments 0 0    
Excess benefits paid 0 0    
Interest accrual 2 2    
Other 0 0    
Changes related to unrealized appreciation (depreciation) of investments 0 0    
Net liability for future policy benefits, end of period 52 54    
Less: Reinsurance recoverable (52) (54)    
Net liability for future policy benefits after reinsurance recoverable $ 0 $ 0    
Weighted average liability duration of the liability for future policy benefits (in years) 8 years 6 months 8 years 8 months 12 days