Investments (excluding Consolidated Investment Entities) - Loans by Loan to Value (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
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%
Commercial mortgage loans	$ 5,373	$ 5,445
0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Loan to value ratio, minimum	0.00%
Loan to value ratio, maximum	50.00%
Commercial mortgage loans	$ 3,577	3,605
50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Loan to value ratio, minimum	50.00%
Loan to value ratio, maximum	60.00%
Commercial mortgage loans	$ 1,399	1,418
60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Loan to value ratio, minimum	60.00%
Loan to value ratio, maximum	70.00%
Commercial mortgage loans	$ 330	402
70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Loan to value ratio, minimum	70.00%
Loan to value ratio, maximum	80.00%
Commercial mortgage loans	$ 10	20
80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Loan to value ratio, minimum	80.00%
Commercial mortgage loans	$ 57	0
Year of Origination 2023
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	344
Year of Origination 2023 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	89
Year of Origination 2023 | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	255
Year of Origination 2023 | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	0
Year of Origination 2023 | 70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	0
Year of Origination 2023 | 80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	0
Year of Origination 2022
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	650	635
Year of Origination 2022 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	243	250
Year of Origination 2022 | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	342	320
Year of Origination 2022 | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	65	65
Year of Origination 2022 | 70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	0	0
Year of Origination 2022 | 80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	0	0
Year of Origination 2021
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	701	777
Year of Origination 2021 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	247	240
Year of Origination 2021 | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	224	272
Year of Origination 2021 | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	230	255
Year of Origination 2021 | 70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	0	10
Year of Origination 2021 | 80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	0	0
Year of Origination 2020
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	332	363
Year of Origination 2020 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	161	119
Year of Origination 2020 | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	145	209
Year of Origination 2020 | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	0	25
Year of Origination 2020 | 70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	10	10
Year of Origination 2020 | 80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	16	0
Year of Origination 2019
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	337	350
Year of Origination 2019 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	234	227
Year of Origination 2019 | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	74	94
Year of Origination 2019 | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	29	29
Year of Origination 2019 | 70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	0	0
Year of Origination 2019 | 80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	0	0
Year of Origination 2018
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	3,009	206
Year of Origination 2018 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	2,603	163
Year of Origination 2018 | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	359	41
Year of Origination 2018 | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	6	2
Year of Origination 2018 | 70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	0	0
Year of Origination 2018 | 80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans	$ 41	0
Year of Origination 2017 and prior
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		3,114
Year of Origination 2017 and prior | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		2,606
Year of Origination 2017 and prior | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		482
Year of Origination 2017 and prior | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		26
Year of Origination 2017 and prior | 70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		0
Year of Origination 2017 and prior | 80% and above
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		$ 0