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Investments (Credit Losses Recognized In Earnings on Fixed Maturity Securities Held by the Company) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Available-for-sale      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Balance, beginning of period $ 138 $ 114 $ 133
Additions to allowance for credit losses not previously recorded 161 124 96
Reductions for securities sold during the period (162) (86) (57)
Reductions for securities with intent to sell 0 81  
Additions (reductions) on securities with previous allowance 40 67 (57)
Write-offs charged against the allowance (17)    
Reclassified to “Assets held-for sale”     (1)
Balance, ending of period 160 138 114
Available-for-sale | U.S. Treasury securities and obligations of U.S. government authorities and agencies      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Balance, beginning of period 0 0 0
Additions to allowance for credit losses not previously recorded 0 0 0
Reductions for securities sold during the period 0 0 0
Reductions for securities with intent to sell 0 0  
Additions (reductions) on securities with previous allowance 0 0 0
Write-offs charged against the allowance 0    
Reclassified to “Assets held-for sale”     0
Balance, ending of period 0 0 0
Available-for-sale | Foreign government bonds      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Balance, beginning of period 1 7 0
Additions to allowance for credit losses not previously recorded 62 11 7
Reductions for securities sold during the period 0 (6) 0
Reductions for securities with intent to sell 0 13  
Additions (reductions) on securities with previous allowance (10) 2 0
Write-offs charged against the allowance 0    
Reclassified to “Assets held-for sale”     0
Balance, ending of period 53 1 7
Available-for-sale | Corporate securities      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Balance, beginning of period 136 107 123
Additions to allowance for credit losses not previously recorded 99 109 89
Reductions for securities sold during the period (162) (80) (48)
Reductions for securities with intent to sell 0 68  
Additions (reductions) on securities with previous allowance 49 68 (56)
Write-offs charged against the allowance (17)    
Reclassified to “Assets held-for sale”     (1)
Balance, ending of period 105 136 107
Available-for-sale | Asset-backed securities      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Balance, beginning of period 1 0 0
Additions to allowance for credit losses not previously recorded 0 4 0
Reductions for securities sold during the period 0 0 0
Reductions for securities with intent to sell 0 0  
Additions (reductions) on securities with previous allowance 1 (3) 0
Write-offs charged against the allowance 0    
Reclassified to “Assets held-for sale”     0
Balance, ending of period 2 1 0
Available-for-sale | Commercial mortgage-backed securities      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Balance, beginning of period 0 0 10
Additions to allowance for credit losses not previously recorded 0 0 0
Reductions for securities sold during the period 0 0 (9)
Reductions for securities with intent to sell 0 0  
Additions (reductions) on securities with previous allowance 0 0 (1)
Write-offs charged against the allowance 0    
Reclassified to “Assets held-for sale”     0
Balance, ending of period 0 0 0
Available-for-sale | Residential mortgage-backed securities      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Balance, beginning of period 0 0 0
Additions to allowance for credit losses not previously recorded 0 0 0
Reductions for securities sold during the period 0 0 0
Reductions for securities with intent to sell 0 0  
Additions (reductions) on securities with previous allowance 0 0 0
Write-offs charged against the allowance 0    
Reclassified to “Assets held-for sale”     0
Balance, ending of period 0 0 0
Fixed maturities, held-to-maturity      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Balance, beginning of period 2 5 9
Current period provision for expected losses (2) (2) (3)
Change in foreign exchange 0 (1) (1)
Balance, ending of period 0 2 5
Fixed maturities, held-to-maturity | U.S. Treasury securities and obligations of U.S. government authorities and agencies      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Balance, beginning of period 0 0 0
Current period provision for expected losses 0 0 0
Change in foreign exchange 0 0 0
Balance, ending of period 0 0 0
Fixed maturities, held-to-maturity | Foreign government bonds      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Balance, beginning of period 0 0 0
Current period provision for expected losses 0 0 0
Change in foreign exchange 0 0 0
Balance, ending of period 0 0 0
Fixed maturities, held-to-maturity | Corporate securities      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Balance, beginning of period 2 5 9
Current period provision for expected losses (2) (2) (3)
Change in foreign exchange 0 (1) (1)
Balance, ending of period 0 2 5
Fixed maturities, held-to-maturity | Asset-backed securities      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Balance, beginning of period 0 0 0
Current period provision for expected losses 0 0 0
Change in foreign exchange 0 0 0
Balance, ending of period 0 0 0
Fixed maturities, held-to-maturity | Commercial mortgage-backed securities      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Balance, beginning of period 0 0 0
Current period provision for expected losses 0 0 0
Change in foreign exchange 0 0 0
Balance, ending of period 0 0 0
Fixed maturities, held-to-maturity | Residential mortgage-backed securities      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Balance, beginning of period 0 0 0
Current period provision for expected losses 0 0 0
Change in foreign exchange 0 0 0
Balance, ending of period $ 0 $ 0 $ 0