DERIVATIVES - Derivatives by Category (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
SCS, SIO, MSO and IUL indexed features
Derivatives, Fair Value [Line Items]
Notional Amount	$ 0	$ 0
Notional Amount - FWH and NI Modco	0	0
Derivative Assets	5,554	0
Derivative Assets - FWH and NI Modco	0	0
Derivative Liabilities	6,985	4,077
Derivative Liabilities - FWH and NI Modco	0	0
Net Derivatives	(1,431)	(4,077)
Funds Withheld Payable
Derivatives, Fair Value [Line Items]
Notional Amount	0	0
Notional Amount - FWH and NI Modco	0	0
Derivative Assets	0	0
Derivative Assets - FWH and NI Modco	0	0
Derivative Liabilities	(567)	0
Derivative Liabilities - FWH and NI Modco	0	0
Net Derivatives	567	0
Modco payable
Derivatives, Fair Value [Line Items]
Notional Amount	0	0
Notional Amount - FWH and NI Modco	0	0
Derivative Assets	823	0
Derivative Assets - FWH and NI Modco	0	0
Derivative Liabilities	0	0
Derivative Liabilities - FWH and NI Modco	0	0
Net Derivatives	823	0
Total embedded derivatives
Derivatives, Fair Value [Line Items]
Notional Amount	0	0
Notional Amount - FWH and NI Modco	0	0
Derivative Assets	6,377	0
Derivative Assets - FWH and NI Modco	0	0
Derivative Liabilities	6,418	4,077
Derivative Liabilities - FWH and NI Modco	0	0
Net Derivatives	(41)	(4,077)
Total derivatives
Derivatives, Fair Value [Line Items]
Notional Amount	16,968	72,418
Notional Amount - FWH and NI Modco	59,364	0
Derivative Assets	8,432	8,025
Derivative Assets - FWH and NI Modco	8,152	0
Derivative Liabilities	14,683	12,502
Derivative Liabilities - FWH and NI Modco	2,193	0
Net Derivatives	(292)	(4,477)
Derivatives: not designated for hedge accounting
Derivatives, Fair Value [Line Items]
Notional Amount	13,876	70,032
Notional Amount - FWH and NI Modco	59,364	0
Derivative Assets	1,969	7,926
Derivative Assets - FWH and NI Modco	8,152	0
Derivative Liabilities	7,884	8,046
Derivative Liabilities - FWH and NI Modco	2,193	0
Net Derivatives	44	(120)
Derivatives: not designated for hedge accounting | Currency swaps
Derivatives, Fair Value [Line Items]
Notional Amount	721	397
Notional Amount - FWH and NI Modco	0	0
Derivative Assets	38	4
Derivative Assets - FWH and NI Modco	0	0
Derivative Liabilities	0	13
Derivative Liabilities - FWH and NI Modco	0	0
Net Derivatives	38	(9)
Derivatives: not designated for hedge accounting | Interest swaps
Derivatives, Fair Value [Line Items]
Notional Amount	258	1,498
Notional Amount - FWH and NI Modco	2,796	0
Derivative Assets	0	0
Derivative Assets - FWH and NI Modco	0	0
Derivative Liabilities	3	166
Derivative Liabilities - FWH and NI Modco	154	0
Net Derivatives	(157)	(166)
Derivatives: not designated for hedge accounting | Futures
Derivatives, Fair Value [Line Items]
Notional Amount	3,739	4,320
Notional Amount - FWH and NI Modco	2,214	0
Derivative Assets	0	0
Derivative Assets - FWH and NI Modco	0	0
Derivative Liabilities	0	0
Derivative Liabilities - FWH and NI Modco	0	0
Net Derivatives	0	0
Derivatives: not designated for hedge accounting | Swaps
Derivatives, Fair Value [Line Items]
Notional Amount	1,784	11,159
Notional Amount - FWH and NI Modco	10,702	0
Derivative Assets	7	38
Derivative Assets - FWH and NI Modco	41	0
Derivative Liabilities	0	0
Derivative Liabilities - FWH and NI Modco	0	0
Net Derivatives	48	38
Derivatives: not designated for hedge accounting | Options
Derivatives, Fair Value [Line Items]
Notional Amount	6,466	39,863
Notional Amount - FWH and NI Modco	38,010	0
Derivative Assets	1,680	7,549
Derivative Assets - FWH and NI Modco	7,849	0
Derivative Liabilities	393	3,396
Derivative Liabilities - FWH and NI Modco	2,039	0
Net Derivatives	7,097	4,153
Derivatives: not designated for hedge accounting | Futures
Derivatives, Fair Value [Line Items]
Notional Amount	807	12,693
Notional Amount - FWH and NI Modco	5,642	0
Derivative Assets	0	0
Derivative Assets - FWH and NI Modco	0	0
Derivative Liabilities	0	0
Derivative Liabilities - FWH and NI Modco	0	0
Net Derivatives	0	0
Derivatives: not designated for hedge accounting | Credit default swaps
Derivatives, Fair Value [Line Items]
Notional Amount	101	102
Notional Amount - FWH and NI Modco	0	0
Derivative Assets	0	0
Derivative Assets - FWH and NI Modco	0	0
Derivative Liabilities	2	2
Derivative Liabilities - FWH and NI Modco	0	0
Net Derivatives	(2)	(2)
Derivatives: not designated for hedge accounting | Margin
Derivatives, Fair Value [Line Items]
Notional Amount	0	0
Notional Amount - FWH and NI Modco	0	0
Derivative Assets	88	193
Derivative Assets - FWH and NI Modco	262	0
Derivative Liabilities	0	0
Derivative Liabilities - FWH and NI Modco	0	0
Net Derivatives	350	193
Derivatives: not designated for hedge accounting | Collateral
Derivatives, Fair Value [Line Items]
Notional Amount	0	0
Notional Amount - FWH and NI Modco	0	0
Derivative Assets	156	142
Derivative Assets - FWH and NI Modco	0	0
Derivative Liabilities	7,486	4,469
Derivative Liabilities - FWH and NI Modco	0	0
Net Derivatives	(7,330)	(4,327)
Cash flow hedges: | Derivatives: designated for hedge accounting
Derivatives, Fair Value [Line Items]
Notional Amount	3,092	2,386
Notional Amount - FWH and NI Modco	0	0
Derivative Assets	86	99
Derivative Assets - FWH and NI Modco	0	0
Derivative Liabilities	381	379
Derivative Liabilities - FWH and NI Modco	0	0
Net Derivatives	(295)	(280)
Cash flow hedges: | Derivatives: designated for hedge accounting | Currency swaps
Derivatives, Fair Value [Line Items]
Notional Amount	2,140	1,431
Notional Amount - FWH and NI Modco	0	0
Derivative Assets	86	99
Derivative Assets - FWH and NI Modco	0	0
Derivative Liabilities	87	85
Derivative Liabilities - FWH and NI Modco	0	0
Net Derivatives	(1)	14
Cash flow hedges: | Derivatives: designated for hedge accounting | Interest swaps
Derivatives, Fair Value [Line Items]
Notional Amount	952	955
Notional Amount - FWH and NI Modco	0	0
Derivative Assets	0	0
Derivative Assets - FWH and NI Modco	0	0
Derivative Liabilities	294	294
Derivative Liabilities - FWH and NI Modco	0	0
Net Derivatives	$ (294)	$ (294)