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Investment Holding Level 4 Mortgage Loans on Real Estate (Details)
5 Months Ended 7 Months Ended 12 Months Ended
May 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2017
USD ($)
Jun. 01, 2018
USD ($)
Dec. 31, 2016
USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Valuation Allowance, Loss Contingency for Loans, LTV Ratio     90.00%      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 2,100,000,000 $ 2,241,000,000      
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan     51.00%      
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan     62.00%      
Secured Debt, Repurchase Agreements     $ 0      
Mortgages [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Investment Owned, Percent of Net Assets   100.00% 100.00%      
Industrial Property [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 580,000,000 $ 603,000,000      
Industrial Property [Member] | Mortgages [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Investment Owned, Percent of Net Assets   27.60% 26.90%      
Hotel [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 24,000,000 $ 24,000,000      
Hotel [Member] | Mortgages [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Investment Owned, Percent of Net Assets   1.10% 1.10%      
Multifamily [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 518,000,000 $ 576,000,000      
Multifamily [Member] | Mortgages [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Investment Owned, Percent of Net Assets   24.70% 25.70%      
Office Building [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 478,000,000 $ 471,000,000      
Office Building [Member] | Mortgages [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Investment Owned, Percent of Net Assets   22.80% 21.00%      
Retail Site [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 286,000,000 $ 398,000,000      
Retail Site [Member] | Mortgages [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Investment Owned, Percent of Net Assets   13.60% 17.80%      
Single Family [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 86,000,000 $ 120,000,000      
Single Family [Member] | Mortgages [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Investment Owned, Percent of Net Assets   4.10% 5.30%      
Other Property [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 128,000,000 $ 49,000,000      
Other Property [Member] | Mortgages [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Investment Owned, Percent of Net Assets   6.10% 2.20%      
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 23,000,000 $ 0      
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   0 0      
Commercial Loan [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Allowance for Loan and Lease Losses, Real Estate $ 0 (5,000,000) 0 $ 0 $ 0 $ (19,000,000)
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   2,100,000,000 2,241,000,000      
Allowance for Loan and Lease Losses, Period Increase (Decrease) 0 (6,000,000) 0 (1,000,000)    
Allowance for Loan and Lease Losses, Write-offs $ 0 $ 1,000,000 $ 5,000,000 $ 20,000,000    
Average Debt Service Coverage Ratio   2.36 2.36      
Commercial Loan [Member] | Mortgages [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Principal Amount of Delinquent Loans   $ 15        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Write-down or Reserve, Amount   16        
Commercial Loan [Member] | LTV Between 65 to 80 Percent [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 340,000,000 $ 269,000,000      
Average Debt Service Coverage Ratio   1.78 1.74      
Commercial Loan [Member] | LTV Less than 65 Percent [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 1,760,000,000 $ 1,972,000,000      
Average Debt Service Coverage Ratio   2.48 2.44      
Region Others [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 397,000,000 $ 426,000,000      
Region Others [Member] | Mortgages [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Investment Owned, Percent of Net Assets   18.90% 19.00%      
West South Central [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 226,000,000 $ 209,000,000      
West South Central [Member] | Mortgages [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Investment Owned, Percent of Net Assets   10.80% 9.30%      
South Atlantic [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 457,000,000 $ 510,000,000      
South Atlantic [Member] | Mortgages [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Investment Owned, Percent of Net Assets   21.80% 22.80%      
Pacific [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 684,000,000 $ 646,000,000      
Pacific [Member] | Mortgages [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Investment Owned, Percent of Net Assets   32.60% 28.80%      
New England [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 79,000,000 $ 85,000,000      
New England [Member] | Mortgages [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Investment Owned, Percent of Net Assets   3.70% 3.80%      
Mountain [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 51,000,000 $ 75,000,000      
Mountain [Member] | Mortgages [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Investment Owned, Percent of Net Assets   2.40% 3.30%      
Middle Atlantic [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 131,000,000 $ 204,000,000      
Middle Atlantic [Member] | Mortgages [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Investment Owned, Percent of Net Assets   6.20% 9.10%      
East South Central [Member] [Domain]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 19,000,000 $ 19,000,000      
East South Central [Member] [Domain] | Mortgages [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Investment Owned, Percent of Net Assets   0.90% 0.90%      
East North Central [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Mortgage Loans on Real Estate, Carrying Amount of Mortgages   $ 56,000,000 $ 67,000,000      
East North Central [Member] | Mortgages [Member]            
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]            
Investment Owned, Percent of Net Assets   2.70% 3.00%