Investments (excluding Consolidated Investment Entities) - Loans by Property Type (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Investment Holdings [Line Items]
Commercial mortgage loans	$ 5,346	$ 5,445
Year of Origination 2023
Investment Holdings [Line Items]
Commercial mortgage loans	58
Year of Origination 2023 | Retail
Investment Holdings [Line Items]
Commercial mortgage loans	15
Year of Origination 2023 | Industrial
Investment Holdings [Line Items]
Commercial mortgage loans	3
Year of Origination 2023 | Apartments
Investment Holdings [Line Items]
Commercial mortgage loans	20
Year of Origination 2023 | Office
Investment Holdings [Line Items]
Commercial mortgage loans	20
Year of Origination 2023 | Hotel/Motel
Investment Holdings [Line Items]
Commercial mortgage loans	0
Year of Origination 2023 | Other
Investment Holdings [Line Items]
Commercial mortgage loans	0
Year of Origination 2023 | Mixed Use
Investment Holdings [Line Items]
Commercial mortgage loans	0
Year of Origination 2023 | Total
Investment Holdings [Line Items]
Commercial mortgage loans	58
Year of Origination 2022
Investment Holdings [Line Items]
Commercial mortgage loans	647	635
Year of Origination 2022 | Retail
Investment Holdings [Line Items]
Commercial mortgage loans	79	79
Year of Origination 2022 | Industrial
Investment Holdings [Line Items]
Commercial mortgage loans	265	255
Year of Origination 2022 | Apartments
Investment Holdings [Line Items]
Commercial mortgage loans	249	247
Year of Origination 2022 | Office
Investment Holdings [Line Items]
Commercial mortgage loans	34	34
Year of Origination 2022 | Hotel/Motel
Investment Holdings [Line Items]
Commercial mortgage loans	10	10
Year of Origination 2022 | Other
Investment Holdings [Line Items]
Commercial mortgage loans	10	10
Year of Origination 2022 | Mixed Use
Investment Holdings [Line Items]
Commercial mortgage loans	0	0
Year of Origination 2022 | Total
Investment Holdings [Line Items]
Commercial mortgage loans	647	635
Year of Origination 2021
Investment Holdings [Line Items]
Commercial mortgage loans	735	777
Year of Origination 2021 | Retail
Investment Holdings [Line Items]
Commercial mortgage loans	37	37
Year of Origination 2021 | Industrial
Investment Holdings [Line Items]
Commercial mortgage loans	165	168
Year of Origination 2021 | Apartments
Investment Holdings [Line Items]
Commercial mortgage loans	381	420
Year of Origination 2021 | Office
Investment Holdings [Line Items]
Commercial mortgage loans	125	125
Year of Origination 2021 | Hotel/Motel
Investment Holdings [Line Items]
Commercial mortgage loans	0	0
Year of Origination 2021 | Other
Investment Holdings [Line Items]
Commercial mortgage loans	18	18
Year of Origination 2021 | Mixed Use
Investment Holdings [Line Items]
Commercial mortgage loans	9	9
Year of Origination 2021 | Total
Investment Holdings [Line Items]
Commercial mortgage loans	735	777
Year of Origination 2020
Investment Holdings [Line Items]
Commercial mortgage loans	343	363
Year of Origination 2020 | Retail
Investment Holdings [Line Items]
Commercial mortgage loans	58	58
Year of Origination 2020 | Industrial
Investment Holdings [Line Items]
Commercial mortgage loans	60	61
Year of Origination 2020 | Apartments
Investment Holdings [Line Items]
Commercial mortgage loans	82	93
Year of Origination 2020 | Office
Investment Holdings [Line Items]
Commercial mortgage loans	143	151
Year of Origination 2020 | Hotel/Motel
Investment Holdings [Line Items]
Commercial mortgage loans	0	0
Year of Origination 2020 | Other
Investment Holdings [Line Items]
Commercial mortgage loans	0	0
Year of Origination 2020 | Mixed Use
Investment Holdings [Line Items]
Commercial mortgage loans	0	0
Year of Origination 2020 | Total
Investment Holdings [Line Items]
Commercial mortgage loans	343	363
Year of Origination 2019
Investment Holdings [Line Items]
Commercial mortgage loans	347	350
Year of Origination 2019 | Retail
Investment Holdings [Line Items]
Commercial mortgage loans	45	46
Year of Origination 2019 | Industrial
Investment Holdings [Line Items]
Commercial mortgage loans	85	85
Year of Origination 2019 | Apartments
Investment Holdings [Line Items]
Commercial mortgage loans	164	165
Year of Origination 2019 | Office
Investment Holdings [Line Items]
Commercial mortgage loans	40	40
Year of Origination 2019 | Hotel/Motel
Investment Holdings [Line Items]
Commercial mortgage loans	13	14
Year of Origination 2019 | Other
Investment Holdings [Line Items]
Commercial mortgage loans	0	0
Year of Origination 2019 | Mixed Use
Investment Holdings [Line Items]
Commercial mortgage loans	0	0
Year of Origination 2019 | Total
Investment Holdings [Line Items]
Commercial mortgage loans	347	350
Year of Origination 2018
Investment Holdings [Line Items]
Commercial mortgage loans	204	206
Year of Origination 2018 | Retail
Investment Holdings [Line Items]
Commercial mortgage loans	37	37
Year of Origination 2018 | Industrial
Investment Holdings [Line Items]
Commercial mortgage loans	83	84
Year of Origination 2018 | Apartments
Investment Holdings [Line Items]
Commercial mortgage loans	55	56
Year of Origination 2018 | Office
Investment Holdings [Line Items]
Commercial mortgage loans	12	12
Year of Origination 2018 | Hotel/Motel
Investment Holdings [Line Items]
Commercial mortgage loans	0	0
Year of Origination 2018 | Other
Investment Holdings [Line Items]
Commercial mortgage loans	17	17
Year of Origination 2018 | Mixed Use
Investment Holdings [Line Items]
Commercial mortgage loans	0	0
Year of Origination 2018 | Total
Investment Holdings [Line Items]
Commercial mortgage loans	204	206
Year of Origination 2017
Investment Holdings [Line Items]
Commercial mortgage loans	3,012	3,114
Year of Origination 2017 | Retail
Investment Holdings [Line Items]
Commercial mortgage loans	858	888
Year of Origination 2017 | Industrial
Investment Holdings [Line Items]
Commercial mortgage loans	742	757
Year of Origination 2017 | Apartments
Investment Holdings [Line Items]
Commercial mortgage loans	639	679
Year of Origination 2017 | Office
Investment Holdings [Line Items]
Commercial mortgage loans	500	513
Year of Origination 2017 | Hotel/Motel
Investment Holdings [Line Items]
Commercial mortgage loans	68	69
Year of Origination 2017 | Other
Investment Holdings [Line Items]
Commercial mortgage loans	154	156
Year of Origination 2017 | Mixed Use
Investment Holdings [Line Items]
Commercial mortgage loans	51	52
Year of Origination 2017 | Total
Investment Holdings [Line Items]
Commercial mortgage loans	3,012	3,114
Total | Retail
Investment Holdings [Line Items]
Commercial mortgage loans	1,129	1,145
Total | Industrial
Investment Holdings [Line Items]
Commercial mortgage loans	1,403	1,410
Total | Apartments
Investment Holdings [Line Items]
Commercial mortgage loans	1,590	1,660
Total | Office
Investment Holdings [Line Items]
Commercial mortgage loans	874	875
Total | Hotel/Motel
Investment Holdings [Line Items]
Commercial mortgage loans	91	93
Total | Other
Investment Holdings [Line Items]
Commercial mortgage loans	199	201
Total | Mixed Use
Investment Holdings [Line Items]
Commercial mortgage loans	60	61
Total | Total
Investment Holdings [Line Items]
Commercial mortgage loans	$ 5,346	$ 5,445