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Investments - Allowance for Credit Loss Aggregated by Investment Category (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period $ (8) $ (19)
For credit losses on securities for which losses were not previously recorded (3) (1)
For initial credit losses on purchased securities accounted for as PCD financial assets 0 0
(Additions) reductions in allowance recorded on previously impaired securities (2) 7
For securities sold during the period 2 0
For securities intended/required to be sold prior to recovery of amortized cost basis 0 0
Write-offs charged against the allowance 0 3
Recoveries of amounts previously written off 0 3
Balance at End of Period (11) (7)
Asset-backed securities    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period (3)  
For credit losses on securities for which losses were not previously recorded 0  
For initial credit losses on purchased securities accounted for as PCD financial assets 0  
(Additions) reductions in allowance recorded on previously impaired securities 0  
For securities sold during the period 2  
For securities intended/required to be sold prior to recovery of amortized cost basis 0  
Write-offs charged against the allowance 0  
Recoveries of amounts previously written off 0  
Balance at End of Period (1)  
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period (2) 0
For credit losses on securities for which losses were not previously recorded 0 (1)
For initial credit losses on purchased securities accounted for as PCD financial assets 0 0
(Additions) reductions in allowance recorded on previously impaired securities 0 0
For securities sold during the period 0 0
For securities intended/required to be sold prior to recovery of amortized cost basis 0 0
Write-offs charged against the allowance 0 0
Recoveries of amounts previously written off 0 0
Balance at End of Period (2) (1)
Corporates    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 0 (16)
For credit losses on securities for which losses were not previously recorded (3) 0
For initial credit losses on purchased securities accounted for as PCD financial assets 0 0
(Additions) reductions in allowance recorded on previously impaired securities 0 7
For securities sold during the period 0 0
For securities intended/required to be sold prior to recovery of amortized cost basis 0 0
Write-offs charged against the allowance 0 3
Recoveries of amounts previously written off 0 3
Balance at End of Period (3) (3)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period (3) (3)
For credit losses on securities for which losses were not previously recorded 0 0
For initial credit losses on purchased securities accounted for as PCD financial assets 0 0
(Additions) reductions in allowance recorded on previously impaired securities (2) 0
For securities sold during the period 0 0
For securities intended/required to be sold prior to recovery of amortized cost basis 0 0
Write-offs charged against the allowance 0 0
Recoveries of amounts previously written off 0 0
Balance at End of Period $ (5) $ (3)