SIGNIFICANT ACCOUNTING POLICIES - Schedule of Market Risk Benefit, Activity (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2020
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			$ 23,416
Previously Reported
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			19,154
Adjustment for reversal of balances recorded in Accumulated Other Comprehensive Income
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			(74)
Adjustments for the cumulative effect of the changes in the instrument-specific credit risk between the original contract issuance date and the transition date
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			971
Adjustments for the remaining difference (exclusive of the instrument specific credit risk change and host contract adjustments) between previous carrying amount and fair value measurement for the MRB
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			3,365
GMxB Legacy | Legacy Segment
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	$ (349)	$ (1,838)	24,404
GMxB Legacy | Legacy Segment | Previously Reported
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			19,891
GMxB Legacy | Legacy Segment | Adjustment for reversal of balances recorded in Accumulated Other Comprehensive Income
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			(70)
GMxB Legacy | Legacy Segment | Adjustments for the cumulative effect of the changes in the instrument-specific credit risk between the original contract issuance date and the transition date
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			461
GMxB Legacy | Legacy Segment | Adjustments for the remaining difference (exclusive of the instrument specific credit risk change and host contract adjustments) between previous carrying amount and fair value measurement for the MRB
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			4,122
GMxB Core | Individual Retirement
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	35	(307)	2,144
GMxB Core | Individual Retirement | Previously Reported
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			2,206
GMxB Core | Individual Retirement | Adjustment for reversal of balances recorded in Accumulated Other Comprehensive Income
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			(4)
GMxB Core | Individual Retirement | Adjustments for the cumulative effect of the changes in the instrument-specific credit risk between the original contract issuance date and the transition date
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			505
GMxB Core | Individual Retirement | Adjustments for the remaining difference (exclusive of the instrument specific credit risk change and host contract adjustments) between previous carrying amount and fair value measurement for the MRB
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			(563)
Purchased MRB | Legacy Segment
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			(3,132)
Purchased MRB | Legacy Segment | Previously Reported
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			(2,943)
Purchased MRB | Legacy Segment | Adjustment for reversal of balances recorded in Accumulated Other Comprehensive Income
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			0
Purchased MRB | Legacy Segment | Adjustments for the cumulative effect of the changes in the instrument-specific credit risk between the original contract issuance date and the transition date
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			5
Purchased MRB | Legacy Segment | Adjustments for the remaining difference (exclusive of the instrument specific credit risk change and host contract adjustments) between previous carrying amount and fair value measurement for the MRB
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			(194)
Purchased MRB | Individual Retirement
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk	$ 32	$ 0
EQUI-VEST Individual | No Effect Of Application Of Accounting Standards Update 2018-12
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			43
SCS | No Effect Of Application Of Accounting Standards Update 2018-12
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			21
Group Retirement Equi-Vest | No Effect Of Application Of Accounting Standards Update 2018-12
Market Risk Benefit [Line Items]
Changes in the instrument-specific credit risk			$ (20)