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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
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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.

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