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Commitments and Contingencies - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]    
Undiscounted liability of future guaranty fund assessments $ 1,000,000 $ 2,000,000
Future credits to premium taxes 14,000,000 15,000,000
Fixed maturity collateral pledged to FHLB 1,211,000,000 771,000,000
Possible losses in excess of amounts accrued 50,000,000  
Liability for unpaid claims and claims adjustment expense, reported claims, amount 47  
Amount of previously accrued interest subject to full or partial reversal if cumulative fund performance is not maintained 79,000,000  
Federal Home Loan Bank Borrowings | Line of Credit    
Loss Contingencies [Line Items]    
Fixed maturity collateral pledged to FHLB 1,211,000,000 $ 771,000,000
Purchase of mortgage loans    
Loss Contingencies [Line Items]    
Amount of purchase commitments 107,000,000  
Investment purchase commitment    
Loss Contingencies [Line Items]    
Amount of purchase commitments 909,000,000  
Investment purchase commitment | VOEs    
Loss Contingencies [Line Items]    
Amount of purchase commitments $ 255,000,000