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Investments - Mortgage Loans (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Maximum loan to value ratio generally allowed 75.00%      
Commercial mortgage loans $ 4,664,000,000 $ 4,919,000,000    
Collective valuation allowance for losses 0 (1,000,000)    
Total net commercial mortgage loans 4,664,000,000 4,918,000,000    
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities 40,000,000 20,000,000 $ 12,000,000  
Mortgage loans in process of foreclosure   0    
Impaired        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial mortgage loans 4,000,000 4,000,000    
Total net commercial mortgage loans 4,000,000 4,000,000    
Not Impaired        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial mortgage loans 4,660,000,000 4,915,000,000    
Collective valuation allowance for losses 0 (1,000,000)    
Total net commercial mortgage loans 4,660,000,000 4,914,000,000    
Mortgage loans on real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Impairments on mortgage loans 2 0    
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities $ 3,000,000      
Financial Asset, 60 to 89 Days Past Due        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans in arrears   $ 0   $ 0