Investments - Loans by Loan to Value (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Schedule of Loans by Loan to Value Ratio [Line Items]
Targeted maximum amount of mortgage loans lended, percent of estimated fair value of underlying real estate	75.00%
Benchmark loan to value ratio, greater than indicates unpaid loan amount exceeds underlying collateral	100.00%
Benchmark debt service coverage ratio, less than indicates property's operations income is less than debt payments	100.00%
Mortgage loans, before Allowance for Credit Loss	$ 4,233	$ 4,694
0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Loan to Value Ratio, minimum	0.00%	0.00%
Loan to Value Ratio, maximum	50.00%	50.00%
Mortgage loans, before Allowance for Credit Loss	$ 2,600	$ 2,969
>50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Loan to Value Ratio, minimum	50.00%	50.00%
Loan to Value Ratio, maximum	60.00%	60.00%
Mortgage loans, before Allowance for Credit Loss	$ 1,299	$ 1,484
>60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Loan to Value Ratio, minimum	60.00%	60.00%
Loan to Value Ratio, maximum	70.00%	70.00%
Mortgage loans, before Allowance for Credit Loss	$ 334	$ 241
>70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Loan to Value Ratio, minimum	70.00%	70.00%
Loan to Value Ratio, maximum	80.00%	80.00%
Mortgage loans, before Allowance for Credit Loss	$ 0	$ 0
>80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Loan to Value Ratio, minimum	80.00%	80.00%
Mortgage loans, before Allowance for Credit Loss	$ 0	$ 0
Year of Origination 2021
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	670
Year of Origination 2021 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	215
Year of Origination 2021 | >50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	273
Year of Origination 2021 | >60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	182
Year of Origination 2021 | >70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0
Year of Origination 2021 | >80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0
Year of Origination 2020
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	385	409
Year of Origination 2020 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	114	164
Year of Origination 2020 | >50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	202	206
Year of Origination 2020 | >60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	69	39
Year of Origination 2020 | >70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	0
Year of Origination 2020 | >80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	0
Year of Origination 2019
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	356	481
Year of Origination 2019 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	150	209
Year of Origination 2019 | >50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	145	165
Year of Origination 2019 | >60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	61	107
Year of Origination 2019 | >70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	0
Year of Origination 2019 | >80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	0
Year of Origination 2018
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	173	288
Year of Origination 2018 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	127	124
Year of Origination 2018 | >50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	43	91
Year of Origination 2018 | >60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	3	73
Year of Origination 2018 | >70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	0
Year of Origination 2018 | >80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	0
Year of Origination 2017
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	748	861
Year of Origination 2017 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	543	499
Year of Origination 2017 | >50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	202	356
Year of Origination 2017 | >60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	3	6
Year of Origination 2017 | >70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	0
Year of Origination 2017 | >80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	0
Year of Origination 2016
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	518	675
Year of Origination 2016 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	290	399
Year of Origination 2016 | >50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	227	275
Year of Origination 2016 | >60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	1	1
Year of Origination 2016 | >70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	0
Year of Origination 2016 | >80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	0
Year of Origination 2015 and prior
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	1,383	1,980
Year of Origination 2015 and prior | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	1,161	1,574
Year of Origination 2015 and prior | >50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	207	391
Year of Origination 2015 and prior | >60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	15	15
Year of Origination 2015 and prior | >70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	0	0
Year of Origination 2015 and prior | >80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Mortgage loans, before Allowance for Credit Loss	$ 0	$ 0