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Investments - Mortgage Loans (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Maximum loan to value ratio generally allowed     75.00%    
Commercial mortgage loans $ 4,741,000,000   $ 4,741,000,000   $ 4,919,000,000
Collective valuation allowance for losses 0   0   (1,000,000)
Total net commercial mortgage loans 4,741,000,000   4,741,000,000   4,918,000,000
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities 1,000,000 $ 1,000,000 $ 19,000,000 $ 10,000,000  
Mortgage Loans in Process of Foreclosure, Amount         0
Mortgage Loans Number of Foreclosures     1    
Mortgage Loans Foreclosed Carrying Amount     $ 4,000,000    
Financing Receivables, 30 to 59 Days Past Due          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans in arrears 0   0   0
Impaired          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial mortgage loans 4,000,000   4,000,000   4,000,000
Total net commercial mortgage loans 4,000,000   4,000,000   4,000,000
Non Impaired          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Commercial mortgage loans 4,737,000,000   4,737,000,000   4,915,000,000
Collective valuation allowance for losses 0   0   (1,000,000)
Total net commercial mortgage loans 4,737,000,000   4,737,000,000   $ 4,914,000,000
Mortgage loans on real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impairment of Real Estate $ 0 $ 0 1 $ 0  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities     $ 2,000,000