Segment Information - Segment Results (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) segment	Mar. 31, 2023 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	3
Segment Reporting Information [Line Items]
Fee income	$ 1,998	$ 1,888
Premiums	38	25
Net investment income	734	707
Other income	1	15
Total revenues	(322)	(764)
Death, other policy benefits and change in policy reserves, net of deferrals	221	228
(Gain) loss from updating future policy benefits cash flow assumptions, net	11	14
Interest credited on other contract holder funds, net of deferrals and amortization	273	285
Interest expense	25	28
Operating costs and other expenses, net of deferrals	685	616
Amortization of deferred acquisition costs	278	293
Pretax income (loss)	903	(2,054)
Corporate And Reconciling Items
Segment Reporting Information [Line Items]
Fee income	1,207	1,105
Premiums	40	27
Net investment income	432	386
Other income	1	15
Total revenues	1,680	1,533
Death, other policy benefits and change in policy reserves, net of deferrals	160	148
(Gain) loss from updating future policy benefits cash flow assumptions, net	9	14
Interest credited on other contract holder funds, net of deferrals and amortization	273	285
Interest expense	25	28
Operating costs and other expenses, net of deferrals	685	616
Amortization of deferred acquisition costs	139	140
Pretax income (loss)	389	302
Operating Segments
Segment Reporting Information [Line Items]
Total operating benefits and expenses	1,291	1,231
Operating Segments | Retail Annuities
Segment Reporting Information [Line Items]
Fee income	1,083	975
Premiums	10	4
Net investment income	152	115
Other income	8	9
Total revenues	1,253	1,103
Death, other policy benefits and change in policy reserves, net of deferrals	16	(15)
(Gain) loss from updating future policy benefits cash flow assumptions, net	1	(2)
Interest credited on other contract holder funds, net of deferrals and amortization	88	98
Interest expense	6	6
Operating costs and other expenses, net of deferrals	586	522
Amortization of deferred acquisition costs	137	138
Total operating benefits and expenses	834	747
Pretax income (loss)	419	356
Operating Segments | Institutional Products
Segment Reporting Information [Line Items]
Fee income	0	0
Premiums	0	0
Net investment income	113	86
Other income	0	0
Total revenues	113	86
Death, other policy benefits and change in policy reserves, net of deferrals	0	0
(Gain) loss from updating future policy benefits cash flow assumptions, net	0	0
Interest credited on other contract holder funds, net of deferrals and amortization	81	76
Interest expense	0	0
Operating costs and other expenses, net of deferrals	1	1
Amortization of deferred acquisition costs	0	0
Total operating benefits and expenses	82	77
Pretax income (loss)	31	9
Operating Segments | Closed Life and Annuity Blocks
Segment Reporting Information [Line Items]
Fee income	112	117
Premiums	30	23
Net investment income	163	167
Other income	7	4
Total revenues	312	311
Death, other policy benefits and change in policy reserves, net of deferrals	144	163
(Gain) loss from updating future policy benefits cash flow assumptions, net	8	16
Interest credited on other contract holder funds, net of deferrals and amortization	104	111
Interest expense	0	0
Operating costs and other expenses, net of deferrals	35	39
Amortization of deferred acquisition costs	2	2
Total operating benefits and expenses	293	331
Pretax income (loss)	19	(20)
Corporate and Other
Segment Reporting Information [Line Items]
Fee income	12	13
Premiums	0	0
Net investment income	4	18
Other income	(14)	2
Total revenues	2	33
Death, other policy benefits and change in policy reserves, net of deferrals	0	0
(Gain) loss from updating future policy benefits cash flow assumptions, net	0	0
Interest credited on other contract holder funds, net of deferrals and amortization	0	0
Interest expense	19	22
Operating costs and other expenses, net of deferrals	63	54
Amortization of deferred acquisition costs	0	0
Total operating benefits and expenses	82	76
Pretax income (loss)	(80)	(43)
Intersegment eliminations
Segment Reporting Information [Line Items]
Total revenues	$ (19)	$ 18