Investments (excluding Consolidated Investment Entities) - Loans by Debt Service Coverage Ratio (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	$ 5,218	$ 5,445
>1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Debt Service Coverage Ratio, minimum	150.00%
>1.25x - 1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Debt Service Coverage Ratio, minimum	125.00%
Debt Service Coverage Ratio, maximum	150.00%
>1.0x - 1.25x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Debt Service Coverage Ratio, minimum	100.00%
Debt Service Coverage Ratio, maximum	125.00%
Less than 1.0x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Debt Service Coverage Ratio, maximum	100.00%
Total Segment | >1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	$ 3,283	3,385
Total Segment | >1.25x - 1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	512	679
Total Segment | >1.0x - 1.25x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	683	805
Total Segment | Less than 1.0x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	740	576
Total Segment | Total Segment
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	5,218	5,445
Year of Origination 2023
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	372
Year of Origination 2023 | >1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	189
Year of Origination 2023 | >1.25x - 1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	116
Year of Origination 2023 | >1.0x - 1.25x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	67
Year of Origination 2023 | Less than 1.0x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	0
Year of Origination 2023 | Total Segment
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	372
Year of Origination 2022
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	651	635
Year of Origination 2022 | >1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	204	331
Year of Origination 2022 | >1.25x - 1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	68	100
Year of Origination 2022 | >1.0x - 1.25x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	192	181
Year of Origination 2022 | Less than 1.0x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	187	23
Year of Origination 2022 | Total Segment
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	651	635
Year of Origination 2021
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	667	777
Year of Origination 2021 | >1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	260	273
Year of Origination 2021 | >1.25x - 1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	14	33
Year of Origination 2021 | >1.0x - 1.25x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	64	269
Year of Origination 2021 | Less than 1.0x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	329	202
Year of Origination 2021 | Total Segment
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	667	777
Year of Origination 2020
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	306	363
Year of Origination 2020 | >1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	211	259
Year of Origination 2020 | >1.25x - 1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	24	11
Year of Origination 2020 | >1.0x - 1.25x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	21	11
Year of Origination 2020 | Less than 1.0x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	50	82
Year of Origination 2020 | Total Segment
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	306	363
Year of Origination 2019
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	334	350
Year of Origination 2019 | >1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	203	222
Year of Origination 2019 | >1.25x - 1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	26	54
Year of Origination 2019 | >1.0x - 1.25x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	84	67
Year of Origination 2019 | Less than 1.0x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	21	7
Year of Origination 2019 | Total Segment
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	334	350
Year of Origination 2018
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	2,888	206
Year of Origination 2018 | >1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	2,216	128
Year of Origination 2018 | >1.25x - 1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	264	27
Year of Origination 2018 | >1.0x - 1.25x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	255	51
Year of Origination 2018 | Less than 1.0x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	153	0
Year of Origination 2018 | Total Segment
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	$ 2,888	206
Year of Origination 2017
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans		3,114
Year of Origination 2017 | >1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans		2,172
Year of Origination 2017 | >1.25x - 1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans		454
Year of Origination 2017 | >1.0x - 1.25x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans		226
Year of Origination 2017 | Less than 1.0x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans		262
Year of Origination 2017 | Total Segment
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans		$ 3,114