Investments (excluding Consolidated Investment Entities) - Loans by Loan to Value Ratio (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 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%
Benchmark loan to value ratio, greater than indicates unpaid loan amount exceeds underlying collateral		100.00%
Debt service coverage benchmark ratio		100.00%
Commercial mortgage loans		$ 5,218	$ 5,445
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%
Commercial mortgage loans		$ 3,638	3,605
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%
Commercial mortgage loans		$ 1,222	1,418
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%
Commercial mortgage loans		$ 314	402
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%
Commercial mortgage loans		$ 10	20
Debt-to-Value Ratio, 80 to 100 Percent
Schedule of Loans by Loan to Value Ratio [Line Items]
Loan to Value Ratio, minimum	80.00%	80.00%
Commercial mortgage loans		$ 34	0
Year of Origination 2023
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		372
Year of Origination 2023 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		150
Year of Origination 2023 | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		222
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 | Debt-to-Value Ratio, 80 to 100 Percent
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		651	635
Year of Origination 2022 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		252	250
Year of Origination 2022 | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		326	320
Year of Origination 2022 | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		73	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 | Debt-to-Value Ratio, 80 to 100 Percent
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		667	777
Year of Origination 2021 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		244	240
Year of Origination 2021 | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		214	272
Year of Origination 2021 | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		209	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 | Debt-to-Value Ratio, 80 to 100 Percent
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		306	363
Year of Origination 2020 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		168	119
Year of Origination 2020 | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		112	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 | Debt-to-Value Ratio, 80 to 100 Percent
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		334	350
Year of Origination 2019 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		238	227
Year of Origination 2019 | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		68	94
Year of Origination 2019 | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		28	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 | Debt-to-Value Ratio, 80 to 100 Percent
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		2,888	206
Year of Origination 2018 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		2,586	163
Year of Origination 2018 | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		280	41
Year of Origination 2018 | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		4	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 | Debt-to-Value Ratio, 80 to 100 Percent
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		$ 18	0
Year of Origination 2017
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans			3,114
Year of Origination 2017 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans			2,606
Year of Origination 2017 | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans			482
Year of Origination 2017 | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans			26
Year of Origination 2017 | 70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans			0
Year of Origination 2017 | Debt-to-Value Ratio, 80 to 100 Percent
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans			$ 0