v3.26.1
Future Policy Benefits - Schedule of liabilities by product (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 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     $ 0 $ (1)
Adjusted beginning of year balance     9,728 10,015
Interest accrual 95 $ 99    
Other 0 0    
Net liability for future policy benefits, end of period 59,204 57,086    
Less: Reinsurance recoverable (20,385) (20,870)    
Net liability for future policy benefits after reinsurance recoverable 38,819 36,216    
Universal Life        
Movement in Liability for Future Policy Benefits [Roll Forward]        
Balance, beginning of year 4,295 4,088    
Effect of changes in experience     90 151
Adjusted beginning of year balance     4,385 4,239
Assessments 163 163    
Excess benefits paid (297) (328)    
Interest accrual 42 40    
Other 1 2    
Changes related to unrealized appreciation (depreciation) of investments (50) 33    
Net liability for future policy benefits, end of period 4,244 4,149    
Less: Reinsurance recoverable (216) (206)    
Net liability for future policy benefits after reinsurance recoverable 4,028 3,943    
Life Insurance        
Movement in Liability for Future Policy Benefits [Roll Forward]        
Effect of changes in experience     4 (1)
Adjusted beginning of year balance     8,873 9,083
Interest accrual 86 89    
Other 0 0    
Net liability for future policy benefits, end of period 13,272 13,324    
Less: Reinsurance recoverable (656) (665)    
Net liability for future policy benefits after reinsurance recoverable $ 12,616 $ 12,659    
Weighted average liability duration of the liability for future policy benefits (in years) 10 years 1 month 6 days 10 years 8 months 12 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 experience     91 152
Adjusted beginning of year balance     4,332 4,186
Assessments 163 163    
Excess benefits paid (297) (328)    
Interest accrual 41 39    
Other 1 2    
Changes related to unrealized appreciation (depreciation) of investments (50) 33    
Net liability for future policy benefits, end of period 4,190 4,095    
Less: Reinsurance recoverable (162) (152)    
Net liability for future policy benefits after reinsurance recoverable $ 4,028 $ 3,943    
Weighted average liability duration of the liability for future policy benefits (in years) 26 years 8 months 12 days 24 years 6 months    
Corporate & Other        
Movement in Liability for Future Policy Benefits [Roll Forward]        
Effect of changes in experience     (4) 0
Adjusted beginning of year balance     855 932
Interest accrual $ 9 $ 10    
Other 0 0    
Net liability for future policy benefits, end of period 19,672 20,399    
Less: Reinsurance recoverable (19,672) (20,161)    
Net liability for future policy benefits after reinsurance recoverable $ 0 $ 238    
Weighted average liability duration of the liability for future policy benefits (in years) 10 years 1 month 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 experience     (1) (1)
Adjusted beginning of year balance     $ 53 $ 53
Assessments 0 0    
Excess benefits paid 0 0    
Interest accrual 1 1    
Other 0 0    
Changes related to unrealized appreciation (depreciation) of investments 0 0    
Net liability for future policy benefits, end of period 54 54    
Less: Reinsurance recoverable (54) (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 7 months 6 days 8 years 9 months 18 days