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Investments - Mortgage Loans (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]      
Maximum loan to value ratio generally allowed 75.00%    
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total commercial mortgage loans $ 4,812,000,000   $ 4,919,000,000
Collective valuation allowance for losses (1,000,000)   (1,000,000)
Total net commercial mortgage loans 4,811,000,000   4,918,000,000
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities 18,000,000 $ 9,000,000  
Mortgage Loans in Process of Foreclosure, Amount 1   0
Financing Receivables, 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans in arrears 1   0
Debt Securities, Available-for-sale, Amortized Cost 4,000,000    
Impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total commercial mortgage loans 8,000,000   4,000,000
Total net commercial mortgage loans 8,000,000   4,000,000
Non Impaired      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total commercial mortgage loans 4,804,000,000   4,915,000,000
Collective valuation allowance for losses (1,000,000)   (1,000,000)
Total net commercial mortgage loans 4,803,000,000   $ 4,914,000,000
Mortgage loans on real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Impairment of Real Estate 1 0  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities $ 2,000,000 $ 0