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Investment Holding Level 4 Mortgage Loans on Real Estate (Details)
$ in Millions
5 Months Ended 7 Months Ended 12 Months Ended
Jan. 01, 2020
USD ($)
May 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Jun. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan       54.00%        
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan       62.00%        
Financing Receivable, Allowance for Credit Loss       $ 17 $ 0      
Mortgage Loans on Real Estate, Carrying Amount of Mortgages       2,109 2,241      
Financing Receivable, Past Due       0        
Debt Securities, Available-for-sale, Purchased with Credit Deterioration, Amount at Purchase Price       $ 0        
Financing Receivable, Modifications, Number of Contracts       0        
Financing Receivable, Held-for-Sale       $ 0        
Commercial Loan [Member]                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Financing Receivable, Individually Evaluated for Impairment       0        
Financing Receivable, Held-for-Sale         0      
Commercial Loan [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       170        
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)   $ 0 $ 5 8 (5)      
Financing Receivable, Allowance for Credit Loss $ 9 $ 0 $ 5 17 0 $ 5 $ 0 $ 0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year       285        
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year       353        
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year       342        
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year       177        
Financing Receivable, Originated, More than Five Years before Current Fiscal Year       782        
Financing Receivable, before Allowance for Credit Loss       $ 2,109        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages         $ 2,241      
Average Debt Service Coverage Ratio         2.36      
Financing Receivable, Past Due         $ 0      
Average Debt Service Coverage Ratio, Year One, Originated, Current Fiscal Year       2.23        
Average Debt Service Coverage Ratio, Year Two, Originated, Fiscal Year Before Current Year       2.56        
Average Debt Service Coverage Ratio, Year Three, Originated, Two Years Before Current Fiscal Year       1.99        
Average Debt Service Coverage Ratio, Year Four, Originated, Three Years Before Current Fiscal Year       2.25        
Average Debt Service Coverage Ratio, Year Five, Originated, Four Years Before Current Fiscal Year       2.90        
Average Debt Service Coverage Ratio, Originated, More Than Five Years Before Current Fiscal Year       2.21        
Average Debt Service Coverage Ratio, Before Allowance for Credit Losses       2.29        
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Commercial Loan [Member]                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 9              
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 | Retained Earnings [Member]                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Financing Receivable, Allowance for Credit Loss $ (9)              
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       $ 80 67      
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 19      
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       154 204      
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       78 75      
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       83 85      
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       562 646      
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       569 510      
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       213 209      
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       351 $ 426      
Mortgage loans [1]                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)       $ 8        
Investment Owned, Percent of Net Assets       100.00% 100.00%      
Mortgage loans [1] | East North Central [Member]                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Investment Owned, Percent of Net Assets       3.80% 3.00%      
Mortgage loans [1] | East South Central [Member] [Domain]                
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%      
Mortgage loans [1] | Middle Atlantic [Member]                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Investment Owned, Percent of Net Assets       7.30% 9.10%      
Mortgage loans [1] | Mountain [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% 3.30%      
Mortgage loans [1] | New England [Member]                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Investment Owned, Percent of Net Assets       3.90% 3.80%      
Mortgage loans [1] | Pacific [Member]                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Investment Owned, Percent of Net Assets       26.70% 28.80%      
Mortgage loans [1] | South Atlantic [Member]                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Investment Owned, Percent of Net Assets       27.00% 22.80%      
Mortgage loans [1] | West South Central [Member]                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Investment Owned, Percent of Net Assets       10.10% 9.30%      
Mortgage loans [1] | Region Others [Member]                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Investment Owned, Percent of Net Assets       16.60% 19.00%      
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       $ 602 $ 603      
Industrial Property [Member] | Mortgage loans [1]                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Investment Owned, Percent of Net Assets       28.60% 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       $ 22 $ 24      
Hotel [Member] | Mortgage loans [1]                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Investment Owned, Percent of Net Assets       1.00% 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       $ 536 $ 576      
Multifamily [Member] | Mortgage loans [1]                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Investment Owned, Percent of Net Assets       25.40% 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       $ 481 $ 471      
Office Building [Member] | Mortgage loans [1]                
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       $ 418 $ 398      
Retail Site [Member] | Mortgage loans [1]                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Investment Owned, Percent of Net Assets       19.80% 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       $ 50 $ 120      
Single Family [Member] | Mortgage loans [1]                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Investment Owned, Percent of Net Assets       2.40% 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       $ 0 $ 49      
Other Property [Member] | Mortgage loans [1]                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                
Investment Owned, Percent of Net Assets       0.00% 2.20%      
LTV Between 65 to 80 Percent [Member] | Commercial Loan [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       $ 6        
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year       78        
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year       175        
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year       94        
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year       1        
Financing Receivable, Originated, More than Five Years before Current Fiscal Year       54        
Financing Receivable, before Allowance for Credit Loss       $ 408        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages         $ 269      
Average Debt Service Coverage Ratio         1.74      
Average Debt Service Coverage Ratio, Year One, Originated, Current Fiscal Year       1.24        
Average Debt Service Coverage Ratio, Year Two, Originated, Fiscal Year Before Current Year       1.56        
Average Debt Service Coverage Ratio, Year Three, Originated, Two Years Before Current Fiscal Year       1.75        
Average Debt Service Coverage Ratio, Year Four, Originated, Three Years Before Current Fiscal Year       1.98        
Average Debt Service Coverage Ratio, Year Five, Originated, Four Years Before Current Fiscal Year       2.95        
Average Debt Service Coverage Ratio, Originated, More Than Five Years Before Current Fiscal Year       1.12        
Average Debt Service Coverage Ratio, Before Allowance for Credit Losses       1.68        
LTV Less than 65 Percent [Member] | Commercial Loan [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       $ 164        
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year       207        
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year       178        
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year       248        
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year       176        
Financing Receivable, Originated, More than Five Years before Current Fiscal Year       728        
Financing Receivable, before Allowance for Credit Loss       $ 1,701        
Mortgage Loans on Real Estate, Carrying Amount of Mortgages         $ 1,972      
Average Debt Service Coverage Ratio         2.44      
Average Debt Service Coverage Ratio, Year One, Originated, Current Fiscal Year       2.26        
Average Debt Service Coverage Ratio, Year Two, Originated, Fiscal Year Before Current Year       2.95        
Average Debt Service Coverage Ratio, Year Three, Originated, Two Years Before Current Fiscal Year       2.24        
Average Debt Service Coverage Ratio, Year Four, Originated, Three Years Before Current Fiscal Year       2.35        
Average Debt Service Coverage Ratio, Year Five, Originated, Four Years Before Current Fiscal Year       2.90        
Average Debt Service Coverage Ratio, Originated, More Than Five Years Before Current Fiscal Year       2.29        
Average Debt Service Coverage Ratio, Before Allowance for Credit Losses       2.44