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Investments - Impaired Commercial Mortgage Loans (Details) - Mortgage Loans on Real Estate [Member] - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Impaired commercial mortgage loans with related allowance, gross $ 6   $ 26
Impaired commercial mortgage loans with no related allowance, gross 0   0
Impaired commercial mortgage loans, gross 6   26
Impaired commercial mortgage loans, reserves (1)   (5)
Impaired commercial mortgage loans with related allowance, net 5   21
Impaired commercial mortgage loans, net 5   $ 21
Average recorded investment in impaired mortgage loans $ 14 $ 102