Segment Information - Reconciliation of Income (Loss) from Operations by Segment to Consolidated Net Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Operating revenues	$ 4,685	$ 4,584
Interest credited	890	822
Interest and debt expense	80	81
Total federal income tax expense (benefit)	(227)	306
Reconciliation of total income (loss) from operations to net income (loss):
Net annuity product features, pre-tax	(1,092)	1,450
Net life insurance product features, pre-tax	42	(130)
Credit loss-related adjustments, pre-tax	(28)	(1)
Investment gains (losses), pre-tax	(103)	(81)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans, pre-tax	(90)	194
Other items, pre-tax	(35)	(186)
Settlement of cost of insurance litigation, before tax		(114)
Severance expense for workforce realignment, before tax	(6)	(49)
Transaction and integration costs for acquisitions or divestiture, before tax	(20)	(10)
Deferred compensation mark-to-market adjustment, before tax	(9)	(13)
Income tax benefit (expense) related to the above pre-tax items	270	(268)
Net income (loss)	(722)	1,222
Operating Segments and Corporate Non Segment
Segment Reporting Information [Line Items]
Operating revenues	4,685	4,584
Benefits and policyholder liability remeasurement (gain) loss	2,028	1,984
Interest credited	890	822
Commissions	557	499
General and administrative expenses	630	613
Interest and debt expense	80	81
Other	138	295
Total operating expenses	4,323	4,294
Total federal income tax expense (benefit)	48	46
Total income (loss) from operations	314	244
Other Operations
Segment Reporting Information [Line Items]
Operating revenues	52	27
Benefits and policyholder liability remeasurement (gain) loss	4	7
Interest credited	14	7
Commissions	0	0
General and administrative expenses	68	57
Interest and debt expense	80	81
Other	(2)	(6)
Total operating expenses	164	146
Total federal income tax expense (benefit)	(17)	(23)
Total income (loss) from operations	(95)	(96)
Annuities | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,198	1,269
Benefits and policyholder liability remeasurement (gain) loss	28	27
Interest credited	419	354
Commissions	298	254
General and administrative expenses	125	120
Interest and debt expense	0	0
Other	(12)	197
Total operating expenses	858	952
Total federal income tax expense (benefit)	50	58
Total income (loss) from operations	290	259
Life Insurance | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,587	1,541
Benefits and policyholder liability remeasurement (gain) loss	1,002	987
Interest credited	287	294
Commissions	99	113
General and administrative expenses	131	143
Interest and debt expense	0	0
Other	100	54
Total operating expenses	1,619	1,591
Total federal income tax expense (benefit)	(16)	(15)
Total income (loss) from operations	(16)	(35)
Group Protection | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,521	1,425
Benefits and policyholder liability remeasurement (gain) loss	994	963
Interest credited	0	1
Commissions	133	109
General and administrative expenses	222	208
Interest and debt expense	0	0
Other	44	43
Total operating expenses	1,393	1,324
Total federal income tax expense (benefit)	27	21
Total income (loss) from operations	101	80
Retirement Plan Services | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	327	322
Benefits and policyholder liability remeasurement (gain) loss	0	0
Interest credited	170	166
Commissions	27	23
General and administrative expenses	84	86
Interest and debt expense	0	0
Other	8	6
Total operating expenses	289	281
Total federal income tax expense (benefit)	4	5
Total income (loss) from operations	$ 34	$ 36