DERIVATIVES AND HEDGING - PREDECESSOR COMPANY - Impact of Derivatives by Operating Segment (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)		$ (811)
Investment gains (losses), net
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	$ 501	$ (912)	$ 6,124	$ (5,262)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Total	Total	Total	Total
Investment gains (losses), net | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	$ 500		$ 6,117	$ (5,264)
Investment gains (losses), net | Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	1		7	2
Net Investment Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	$ 1		$ 13	$ 18
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net investment income		Net investment income	Net investment income
Net Investment Income | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	$ 0		$ 0	$ 0
Net Investment Income | Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	1		13	18
Other income (loss)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	$ 2	$ 101	$ 14	$ (25)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other income (loss)	Other income (loss)	Other income (loss)	Other income (loss)
Other income (loss) | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	$ 0		$ 0	$ 0
Other income (loss) | Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	2		14	(25)
Change in AOCI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	$ 4		$ 68	$ (43)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net unrealized investment gains (losses)		Net unrealized investment gains (losses)	Net unrealized investment gains (losses)
Change in AOCI | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	$ 0		$ 0	$ 0
Change in AOCI | Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	4		68	(43)
Interest Rate | Investment gains (losses), net | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	(527)		(1,749)	4,453
Interest Rate | Net Investment Income | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	0		0	0
Interest Rate | Other income (loss) | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	0		0	0
Interest Rate | Change in AOCI | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	0		0	0
Currency | Investment gains (losses), net | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	0		2	(1)
Currency | Net Investment Income | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	0		0	0
Currency | Other income (loss) | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	0		0	0
Currency | Change in AOCI | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	0		0	0
Currency/Interest Rate | Investment gains (losses), net | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	(6)		12	(15)
Currency/Interest Rate | Investment gains (losses), net | Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	1		7	2
Currency/Interest Rate | Net Investment Income | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	0		0	0
Currency/Interest Rate | Net Investment Income | Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	1		13	18
Currency/Interest Rate | Other income (loss) | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	0		0	0
Currency/Interest Rate | Other income (loss) | Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	2		14	(25)
Currency/Interest Rate | Change in AOCI | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	0		0	0
Currency/Interest Rate | Change in AOCI | Designated as Hedging Instrument | Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	4		68	(43)
Credit | Investment gains (losses), net | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	(12)		17	0
Credit | Net Investment Income | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	0		0	0
Credit | Other income (loss) | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	0		0	0
Credit | Change in AOCI | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	0		0	0
Equity | Investment gains (losses), net | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	59		(1,465)	(5,290)
Equity | Net Investment Income | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	0		0	0
Equity | Other income (loss) | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	0		0	0
Equity | Change in AOCI | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	0		0	0
Embedded Derivatives | Investment gains (losses), net | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	986		9,300	(4,411)
Embedded Derivatives | Net Investment Income | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	0		0	0
Embedded Derivatives | Other income (loss) | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	0		0	0
Embedded Derivatives | Change in AOCI | Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Gain/(Loss)	$ 0		$ 0	$ 0