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Investments, Amortized Cost Basis of Mortgage Loans for Each Credit Quality Indicator by Year of Origination (Details) - Mortgage Loans [Member] $ in Millions	Mar. 31, 2021 USD ($)	[1]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2021	$ 15
2020	161
2019	284
2018	103
2017	178
Prior	328
Total	1,069
DSCR Greater than or Equal to 1.6x, LTV Less than 55% [Member]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2020	75
2019	32
2018	36
2017	114
Prior	187
Total	444
DSCR Greater than or Equal to 1.6x, LTV 55% to 65% [Member]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2020	14
2019	20
2018	14
2017	15
Prior	11
Total	74
DSCR Greater than or Equal to 1.6x, LTV Greater than 65% [Member]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2021	5
2019	5
Prior	24
Total	34
DSCR Between 1.2 to 1.6x, LTV Less than 55% [Member]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2019	16
2017	5
Prior	77
Total	98
DSCR Between 1.2 to 1.6x, LTV 55% to 65% [Member]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2020	20
2019	40
2018	53
2017	27
Total	140
DSCR Between 1.2 to 1.6x, LTV Greater than 65% [Member]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2021	10
2020	52
2019	44
2017	9
Prior	12
Total	127
DSCR Less than or Equal to 1.2x, LTV Less than 55% [Member]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2019	50
2017	8
Prior	10
Total	68
DSCR Less than or Equal to 1.2x, LTV 55% to 65% [Member]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2019	48
Total	48
DSCR Less than or Equal to 1.2x, LTV Greater than 65% [Member]
Mortgage Loans Amortized Cost Basis by Origination Year [Abstract]
2019	29
Prior	7
Total	$ 36
[1] The values in the table above reflect DSCR on a standardized amortization period and LTV ratios based on the most recent appraised values trended forward using changes in a commercial real estate price index.

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Amount of financing receivable originated more than five years prior to current fiscal year.

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