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	$ 4,167	$ 4,126
Interest credited	823	752
Interest and debt expense	40	48
Total federal income tax expense (benefit)	(152)	166
Reconciliation of total income (loss) from operations to net income (loss):
Net annuity product features, pre-tax	(473)	997
Net life insurance product features, pre-tax	21	(131)
Credit loss-related adjustments, pre-tax	(28)	(1)
Investment gains (losses), pre-tax	37	(56)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans, pre-tax	(177)	48
GLB rider fees ceded to LNBAR, pre-tax	(232)	(230)
Other items, pre-tax	(32)	(71)
Certain legal accruals, before tax		(3)
Severance expense for workforce realignment, before tax	(6)	(49)
Transaction and integration costs for acquisitions or divestiture, before tax	(20)	(11)
Deferred compensation mark-to-market adjustment, before tax	(6)	(8)
Income tax benefit (expense) related to the above pre-tax items	187	(122)
Net income (loss)	(439)	657
Operating Segments and Corporate Non Segment
Segment Reporting Information [Line Items]
Operating revenues	4,167	4,126
Benefits and policyholder liability remeasurement (gain) loss	1,745	1,730
Interest credited	823	752
Commissions	540	497
General and administrative expenses	608	594
Interest and debt expense	40	48
Other	117	231
Total operating expenses	3,873	3,852
Total federal income tax expense (benefit)	36	51
Total income (loss) from operations	258	223
Other Operations
Segment Reporting Information [Line Items]
Operating revenues	42	26
Benefits and policyholder liability remeasurement (gain) loss	2	1
Interest credited	13	10
Commissions	0	0
General and administrative expenses	48	38
Interest and debt expense	40	48
Other	0	(1)
Total operating expenses	103	96
Total federal income tax expense (benefit)	(6)	(10)
Total income (loss) from operations	(55)	(60)
Annuities | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,118	1,178
Benefits and policyholder liability remeasurement (gain) loss	27	27
Interest credited	420	353
Commissions	298	254
General and administrative expenses	125	120
Interest and debt expense	0	0
Other	(13)	146
Total operating expenses	857	900
Total federal income tax expense (benefit)	34	55
Total income (loss) from operations	227	223
Life Insurance | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,211	1,181
Benefits and policyholder liability remeasurement (gain) loss	731	739
Interest credited	220	222
Commissions	88	111
General and administrative expenses	129	142
Interest and debt expense	0	0
Other	93	37
Total operating expenses	1,261	1,251
Total federal income tax expense (benefit)	(19)	(19)
Total income (loss) from operations	(31)	(51)
Group Protection | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,472	1,424
Benefits and policyholder liability remeasurement (gain) loss	985	963
Interest credited	0	1
Commissions	127	109
General and administrative expenses	222	209
Interest and debt expense	0	0
Other	29	42
Total operating expenses	1,363	1,324
Total federal income tax expense (benefit)	23	21
Total income (loss) from operations	86	79
Retirement Plan Services | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	324	317
Benefits and policyholder liability remeasurement (gain) loss	0	0
Interest credited	170	166
Commissions	27	23
General and administrative expenses	84	85
Interest and debt expense	0	0
Other	8	7
Total operating expenses	289	281
Total federal income tax expense (benefit)	4	4
Total income (loss) from operations	$ 31	$ 32