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Investments, Amortized Cost Basis of Mortgage Loans for Each Credit Quality Indicator by Year of Origination (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Loan
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]  
Number of loans that were past due or placed in nonaccrual status | Loan 0
Interest income write-off $ 0
Mortgage Loans [Member]  
Mortgage Loans [Abstract]  
Increase in allowance for credit losses 13
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]  
2020 60 [1]
2019 297 [1]
2018 115 [1]
2017 219 [1]
2016 85 [1]
Prior 265 [1]
Total 1,041 [1]
Mortgage Loans [Member] | DSCR Greater than or Equal to 1.6x, LTV Less than 55% [Member]  
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]  
2020 60 [1]
2019 32 [1]
2018 19 [1]
2017 92 [1]
2016 41 [1]
Prior 130 [1]
Total 374 [1]
Mortgage Loans [Member] | DSCR Greater than or Equal to 1.6x, LTV 55% to 65% [Member]  
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]  
2019 32 [1]
2018 29 [1]
2017 55 [1]
2016 4 [1]
Total 120 [1]
Mortgage Loans [Member] | DSCR Greater than or Equal to 1.6x, LTV Greater than 65% [Member]  
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]  
2019 5 [1]
Total 5 [1]
Mortgage Loans [Member] | DSCR Between 1.2 to 1.6x, LTV Less than 55% [Member]  
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]  
2019 33 [1]
2018 10 [1]
2017 13 [1]
2016 16 [1]
Prior 126 [1]
Total 198 [1]
Mortgage Loans [Member] | DSCR Between 1.2 to 1.6x, LTV 55% to 65% [Member]  
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]  
2019 73 [1]
2018 32 [1]
2017 32 [1]
Total 137 [1]
Mortgage Loans [Member] | DSCR Between 1.2 to 1.6x, LTV Greater than 65% [Member]  
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]  
2019 85 [1]
Total 85 [1]
Mortgage Loans [Member] | DSCR Less than or Equal to 1.2x, LTV Less than 55% [Member]  
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]  
2019 1 [1]
2018 11 [1]
2017 27 [1]
Prior 9 [1]
Total 48 [1]
Mortgage Loans [Member] | DSCR Less than or Equal to 1.2x, LTV 55% to 65% [Member]  
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]  
2019 14 [1]
2018 14 [1]
Total 28 [1]
Mortgage Loans [Member] | DSCR Less than or Equal to 1.2x, LTV Greater than 65% [Member]  
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]  
2019 22 [1]
2016 24 [1]
Total $ 46 [1]
[1] The values in the table above reflect DSCR on a standardized amortization period and LTV based on the most recent appraised values trended forward using changes in a commercial real estate price index.