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Investments (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Gain (Loss) on Securities [Line Items]      
Non-income producing fixed maturity securities $ 0 $ 0  
Investments that exceed ten percent of stockholders' equity 0 0  
Investment and derivative, realized gain (loss), coinsurance agreement     $ 18,000,000
Gross gains 48,000,000 75,000,000 120,000,000
Debt securities, available-for-sale, realized loss 150,000,000 166,000,000 261,000,000
Mortgage loan losses due to changes in expected credit losses 0 11,000,000 $ 8,000,000
Limited partnership investments 2,520,000,000 2,174,000,000  
Undistributed earnings of limited partnership investments $ 334,000,000 $ 250,000,000  
Percentage of limited partnerships reported on a current basis 14.00%    
Percentage of limited partnerships reported on a one month lag 3.00%    
Limited partnerships invested in private debt and equity 86.00% 85.00%  
Percentage of limited partnerships employing hedge fund strategies focused on fixed income and equity investments 14.00% 15.00%  
Carrying value of ten largest limited partnerships $ 648,000,000 $ 622,000,000  
Carrying value of limited partnerships as percentage of aggregate partnership equity 1.00% 1.00%  
Income as percentage of change in partnership equity for all limited partnerships 1.00% 1.00% 2.00%
Obligation to return cash $ 0 $ 1,000,000  
Derivative liability, subject to master netting arrangement, collateral, right to reclaim cash offset 0 0  
Commitments to purchase or fund privately placed debt securities 1,660,000,000    
Commitments to sell various privately placed debt securities 30,000,000    
Carrying value of securities deposited under requirements of regulatory authorities 3,100,000,000 3,100,000,000  
Cash and securities deposited as collateral for letters of credit 700,000,000 900,000,000  
Fixed maturity securities      
Gain (Loss) on Securities [Line Items]      
OCI, debt securities, available-for-sale, gain (loss), after adjustment, before tax (352,000,000) 1,431,000,000 $ (7,850,000,000)
Debt securities, available-for-sale, accrued interest, after allowance for credit loss 442,000,000 435,000,000  
Mortgage loans      
Gain (Loss) on Securities [Line Items]      
Financing receivable, accrued interest, after allowance for credit loss 4,000,000    
Amortized cost of mortgage loans 48,000,000    
Financing receivable, allowance for credit loss $ 14,000,000    
Non-income producing mortgage loans   $ 20,000,000  
Funds Withheld Liability Securities      
Gain (Loss) on Securities [Line Items]      
Gross gains     62,000,000
Debt securities, available-for-sale, realized loss     $ 44,000,000