Segment Information - Reconciliation of Income (Loss) from Operations by Segment to Consolidated Net Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Number Of Reportable Segments Disclosed By Definition Flag	We provide products and services and report results through our Annuities, Life Insurance, Group Protection and Retirement Plan Services business segments.
Operating revenues	$ 4,283	$ 4,167
Interest credited	936	823
Interest and debt expense	26	40
Total federal income tax expense (benefit)	(52)	(152)
Reconciliation of total income (loss) from operations to net income (loss):
Net annuity product features, pre-tax	(366)	(473)
Net life insurance product features, pre-tax	21	21
Credit loss-related adjustments, pre-tax	(20)	(28)
Investment gains (losses), pre-tax	(6)	37
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans, pre-tax	251	(177)
GLB rider fees ceded to LNBAR, pre-tax	(236)	(232)
Gains (losses) on other non-financial assets, pre-tax	(2)
Other items, pre-tax	(117)	(32)
Income tax benefit (expense) related to the above pre-tax items	99	187
Net income (loss)	(93)	(439)
Changes in non-performance	(713)	(619)
Legal fees	(122)
Severance expense for workforce realignment, before tax	(7)	(6)
Transaction and integration costs for acquisitions or divestiture, before tax		(20)
Deferred compensation mark-to-market adjustment, before tax	12	(6)
Embedded Derivative Instruments
Reconciliation of total income (loss) from operations to net income (loss):
Gain (loss) on derivatives	149	(33)
Qualifying Hedges
Reconciliation of total income (loss) from operations to net income (loss):
Gain (loss) on derivatives	198	179
Operating Segments and Corporate Non Segment
Segment Reporting Information [Line Items]
Operating revenues	4,283	4,167
Benefits and policyholder liability remeasurement (gain) loss	1,703	1,745
Interest credited	936	823
Commissions	565	540
General and administrative expenses	615	608
Interest and debt expense	26	40
Other	107	117
Total operating expenses	3,952	3,873
Total federal income tax expense (benefit)	48	36
Total income (loss) from operations	283	258
Other Operations
Segment Reporting Information [Line Items]
Operating revenues	60	42
Benefits and policyholder liability remeasurement (gain) loss	2	2
Interest credited	43	13
Commissions	1	0
General and administrative expenses	38	48
Interest and debt expense	26	40
Other	0	0
Total operating expenses	110	103
Total federal income tax expense (benefit)	(11)	(6)
Total income (loss) from operations	(39)	(55)
Reconciliation of total income (loss) from operations to net income (loss):
Gains (losses) on other non-financial assets, pre-tax	(2)
Annuities | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,156	1,118
Benefits and policyholder liability remeasurement (gain) loss	23	27
Interest credited	495	420
Commissions	339	298
General and administrative expenses	132	125
Interest and debt expense	0	0
Other	(42)	(13)
Total operating expenses	947	857
Total federal income tax expense (benefit)	33	34
Total income (loss) from operations	176	227
Reconciliation of total income (loss) from operations to net income (loss):
Gains (losses) on other non-financial assets, pre-tax	0
Life Insurance | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,231	1,211
Benefits and policyholder liability remeasurement (gain) loss	711	731
Interest credited	228	220
Commissions	74	88
General and administrative expenses	127	129
Interest and debt expense	0	0
Other	92	93
Total operating expenses	1,232	1,261
Total federal income tax expense (benefit)	(8)	(19)
Total income (loss) from operations	7	(31)
Reconciliation of total income (loss) from operations to net income (loss):
Gains (losses) on other non-financial assets, pre-tax	0
Group Protection | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,493	1,472
Benefits and policyholder liability remeasurement (gain) loss	967	985
Interest credited	0	0
Commissions	122	127
General and administrative expenses	229	222
Interest and debt expense	0	0
Other	49	29
Total operating expenses	1,367	1,363
Total federal income tax expense (benefit)	27	23
Total income (loss) from operations	99	86
Reconciliation of total income (loss) from operations to net income (loss):
Gains (losses) on other non-financial assets, pre-tax	0
Retirement Plan Services | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	343	324
Benefits and policyholder liability remeasurement (gain) loss	0	0
Interest credited	170	170
Commissions	29	27
General and administrative expenses	89	84
Interest and debt expense	0	0
Other	8	8
Total operating expenses	296	289
Total federal income tax expense (benefit)	7	4
Total income (loss) from operations	40	$ 31
Reconciliation of total income (loss) from operations to net income (loss):
Gains (losses) on other non-financial assets, pre-tax	$ 0