Investments (excluding Consolidated Investment Entities) - Loans by Loan to Value Ratio (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
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%
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%
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%
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%
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%
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%
Year of Origination 2024 [Member] | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		$ 138
Year of Origination 2024 [Member] | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		131
Year of Origination 2024 [Member] | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		15
Year of Origination 2024 [Member] | 70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		0
Year of Origination 2024 [Member] | 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 2023 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		96	$ 150
Year of Origination 2023 | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		221	222
Year of Origination 2023 | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		40	0
Year of Origination 2023 | 70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		0	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	0
Year of Origination 2022 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		239	252
Year of Origination 2022 | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		282	326
Year of Origination 2022 | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		95	73
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 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		240	244
Year of Origination 2021 | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		184	214
Year of Origination 2021 | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		95	209
Year of Origination 2021 | 70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		0	0
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 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		184	168
Year of Origination 2020 | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		71	112
Year of Origination 2020 | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		0	0
Year of Origination 2020 | 70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		0	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		0	16
Year of Origination 2019 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		2,500	238
Year of Origination 2019 | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		148	68
Year of Origination 2019 | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		2	28
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		18	0
Year of Origination 2018 | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans			2,586
Year of Origination 2018 | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans			280
Year of Origination 2018 | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans			4
Year of Origination 2018 | 70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans			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
Total Segment | 0% - 50%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		3,397	3,638
Total Segment | 50% - 60%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		1,037	1,222
Total Segment | 60% - 70%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		247	314
Total Segment | 70% - 80%
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		0	10
Total Segment | Debt-to-Value Ratio, 80 to 100 Percent
Schedule of Loans by Loan to Value Ratio [Line Items]
Commercial mortgage loans		$ 18	$ 34