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Level 4 - Mortgage Loans- Valuation Allowance Activity (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate $ 2,085   $ 2,100
Commercial Loan [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate 2,085   2,100
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 5 $ 0  
(Additions)/Reversals 0 0  
Deductions 5 0  
Ending balance 0 $ 0  
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate $ 0   $ 23