Investments (excluding Consolidated Investment Entities) - Loans by Debt Service Coverage Ratio (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
>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
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	$ 4,699	$ 5,218
Year of Origination 2024 [Member] | >1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	161
Year of Origination 2024 [Member] | >1.25x - 1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	93
Year of Origination 2024 [Member] | >1.0x - 1.25x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	28
Year of Origination 2024 [Member] | Less than 1.0x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	2
Year of Origination 2024 [Member] | Total Segment
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	284
Year of Origination 2023 | >1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	118	189
Year of Origination 2023 | >1.25x - 1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	180	116
Year of Origination 2023 | >1.0x - 1.25x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	48	67
Year of Origination 2023 | Less than 1.0x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	11	0
Year of Origination 2023 | Total Segment
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	357	372
Year of Origination 2022 | >1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	295	204
Year of Origination 2022 | >1.25x - 1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	101	68
Year of Origination 2022 | >1.0x - 1.25x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	76	192
Year of Origination 2022 | Less than 1.0x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	144	187
Year of Origination 2022 | Total Segment
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	616	651
Year of Origination 2021 | >1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	258	260
Year of Origination 2021 | >1.25x - 1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	16	14
Year of Origination 2021 | >1.0x - 1.25x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	97	64
Year of Origination 2021 | Less than 1.0x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	148	329
Year of Origination 2021 | Total Segment
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	519	667
Year of Origination 2020 | >1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	207	211
Year of Origination 2020 | >1.25x - 1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	20	24
Year of Origination 2020 | >1.0x - 1.25x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	20	21
Year of Origination 2020 | Less than 1.0x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	8	50
Year of Origination 2020 | Total Segment
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	255	306
Year of Origination 2019 | >1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	2,018	203
Year of Origination 2019 | >1.25x - 1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	219	26
Year of Origination 2019 | >1.0x - 1.25x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	346	84
Year of Origination 2019 | Less than 1.0x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	85	21
Year of Origination 2019 | Total Segment
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	2,668	334
Year of Origination 2018 | >1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans		2,216
Year of Origination 2018 | >1.25x - 1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans		264
Year of Origination 2018 | >1.0x - 1.25x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans		255
Year of Origination 2018 | Less than 1.0x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans		153
Year of Origination 2018 | Total Segment
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans		2,888
Total Segment | >1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	3,057	3,283
Total Segment | >1.25x - 1.5x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	629	512
Total Segment | >1.0x - 1.25x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	615	683
Total Segment | Less than 1.0x
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	398	740
Total Segment | Total Segment
Schedule of Loans by Debt Service Coverage Ratio [Line Items]
Commercial mortgage loans	$ 4,699	$ 5,218