Segment Information - Reconciliation of Income (Loss) from Operations by Segment to Consolidated Net Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Operating revenues	$ 4,780	$ 4,603	$ 14,190	$ 13,714
Interest credited	954	880	2,759	2,555
Interest and debt expense	79	86	146	253
Total federal income tax expense (benefit)	79	(175)	0	334
Reconciliation of total income (loss) from operations to net income (loss):
Net annuity product features, pre-tax	410	(381)	(277)	1,319
Net life insurance product features, pre-tax	(22)	(125)	(37)	(253)
Credit loss-related adjustments, pre-tax	(38)	(88)	(91)	(124)
Investment gains (losses), pre-tax	(35)	(105)	(218)	(416)
Changes in the fair value of reinsurance-related embedded derivatives, trading securities and certain mortgage loans, pre-tax	(191)	(446)	(266)	(51)
Gains (losses) on other non-financial assets – sale of subsidiaries/businesses, pre-tax		(2)		582
Other items, pre-tax	(105)	(19)	(65)	(238)
Income tax benefit (expense) related to the above pre-tax items	(5)	246	194	(202)
Net income (loss)	445	(528)	423	1,588
Increase (decrease) in MRBs	337	(666)	(33)	1,354
Settlement of cost of insurance litigation, before tax				(114)
Legal accruals	(9)		(9)
Severance expense for workforce realignment, before tax	(5)	(16)	(13)	(72)
Transaction and integration costs for acquisitions or divestiture, before tax		(2)		(39)
Deferred compensation mark-to-market adjustment, before tax	(14)	(1)	(22)	(13)
Gain (loss) on modification or early extinguishment of debt, pre-tax			94	0
Wealth Management Business
Reconciliation of total income (loss) from operations to net income (loss):
Transaction and integration costs for acquisitions or divestiture, before tax			(20)
Captive Reinsurance Subsidiaries
Reconciliation of total income (loss) from operations to net income (loss):
Transaction and integration costs for acquisitions or divestiture, before tax	(55)		(55)
Bain Capital Prairie, LLC
Reconciliation of total income (loss) from operations to net income (loss):
Transaction and integration costs for acquisitions or divestiture, before tax			(18)
Embedded Derivative Instruments
Reconciliation of total income (loss) from operations to net income (loss):
Change in fair value of derivatives	43	97	63	315
Qualifying Hedges
Segment Reporting Information [Line Items]
Interest and debt expense			146	253
Reconciliation of total income (loss) from operations to net income (loss):
Change in fair value of derivatives	30	188	(307)	(350)
Operating Segments and Corporate Non Segment
Segment Reporting Information [Line Items]
Operating revenues	4,780	4,603	14,190	13,714
Benefits and policyholder liability remeasurement (gain) loss	1,912	1,891	5,847	5,793
Interest credited	954	880	2,759	2,555
Commissions	611	547	1,738	1,566
General and administrative expenses	637	631	1,892	1,872
Interest and debt expense	79	86	240	253
Other	81	107	328	534
Total operating expenses	4,274	4,142	12,804	12,573
Total federal income tax expense (benefit)	75	69	203	170
Total income (loss) from operations	431	392	1,183	971
Other Operations
Segment Reporting Information [Line Items]
Operating revenues	50	52	143	118
Benefits and policyholder liability remeasurement (gain) loss	4	(3)	14	12
Interest credited	22	8	49	24
Commissions	3	0	4	0
General and administrative expenses	65	67	189	187
Interest and debt expense	79	86	240	253
Other	4	(1)	3	(10)
Total operating expenses	177	157	499	466
Total federal income tax expense (benefit)	(28)	(21)	(74)	(72)
Total income (loss) from operations	(99)	(84)	(282)	(276)
Annuities | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,270	1,195	3,682	3,673
Benefits and policyholder liability remeasurement (gain) loss	24	38	84	105
Interest credited	459	399	1,317	1,129
Commissions	327	285	917	808
General and administrative expenses	130	122	381	358
Interest and debt expense	0	0	0	0
Other	(38)	(8)	(63)	245
Total operating expenses	902	836	2,636	2,645
Total federal income tax expense (benefit)	58	58	160	171
Total income (loss) from operations	310	301	886	857
Life Insurance | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,610	1,589	4,798	4,640
Benefits and policyholder liability remeasurement (gain) loss	961	937	2,919	2,886
Interest credited	298	302	874	894
Commissions	119	120	329	346
General and administrative expenses	134	138	397	421
Interest and debt expense	0	0	0	0
Other	74	71	253	172
Total operating expenses	1,586	1,568	4,772	4,719
Total federal income tax expense (benefit)	(1)	(1)	(14)	(31)
Total income (loss) from operations	25	22	40	(48)
Reconciliation of total income (loss) from operations to net income (loss):
Transaction and integration costs for acquisitions or divestiture, before tax	(22)		(22)
Group Protection | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	1,507	1,432	4,566	4,299
Benefits and policyholder liability remeasurement (gain) loss	923	919	2,830	2,790
Interest credited	1	1	1	3
Commissions	132	114	404	336
General and administrative expenses	225	219	674	653
Interest and debt expense	0	0	0	0
Other	38	42	121	114
Total operating expenses	1,319	1,295	4,030	3,896
Total federal income tax expense (benefit)	39	28	113	85
Total income (loss) from operations	149	109	423	318
Retirement Plan Services | Operating Segments
Segment Reporting Information [Line Items]
Operating revenues	343	335	1,001	984
Benefits and policyholder liability remeasurement (gain) loss	0	0	0	0
Interest credited	174	170	518	505
Commissions	30	28	84	76
General and administrative expenses	83	85	251	253
Interest and debt expense	0	0	0	0
Other	3	3	14	13
Total operating expenses	290	286	867	847
Total federal income tax expense (benefit)	7	5	18	17
Total income (loss) from operations	$ 46	$ 44	$ 116	$ 120