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Investments - Allowance for Credit Loss Aggregated By Investment Category (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period $ (19) $ 0
For credit losses on securities for which losses were not previously recorded (2) (7)
For initial credit losses on purchased securities accounted for as PCD financial assets (1) (35)
(Additions) reductions in allowance recorded on previously impaired securities 2 10
For securities sold during the period 0 7
For securities intended/required to be sold prior to recovery of amortized cost basis 0 4
Write offs charged against the allowance 8 2
Recoveries of amounts previously written off 4  
Balance at End of Period (8) (19)
Asset-backed securities    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 0 0
For credit losses on securities for which losses were not previously recorded 0 7
For initial credit losses on purchased securities accounted for as PCD financial assets (1) (9)
(Additions) reductions in allowance recorded on previously impaired securities (2) 2
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  
Balance at End of Period (3) 0
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 0  
For credit losses on securities for which losses were not previously recorded (2)  
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 0  
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 (2) 0
Corporates    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period (16) 0
For credit losses on securities for which losses were not previously recorded 0 (16)
For initial credit losses on purchased securities accounted for as PCD financial assets 0 (16)
(Additions) reductions in allowance recorded on previously impaired securities 4 7
For securities sold during the period 0 3
For securities intended/required to be sold prior to recovery of amortized cost basis 0 4
Write offs charged against the allowance 8 2
Recoveries of amounts previously written off 4  
Balance at End of Period 0 (16)
Hybrids    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 0 0
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 (3)
(Additions) reductions in allowance recorded on previously impaired securities 0 0
For securities sold during the period 0 3
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  
Balance at End of Period 0 0
Residential mortgage-backed securities    
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period (3) 0
For credit losses on securities for which losses were not previously recorded 0 2
For initial credit losses on purchased securities accounted for as PCD financial assets 0 (7)
(Additions) reductions in allowance recorded on previously impaired securities 0 1
For securities sold during the period 0 1
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  
Balance at End of Period $ (3) $ (3)