DERIVATIVES AND HEDGING - SUCCESSOR COMPANY - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Offsetting of Financial Assets:
Gross Amounts of Recognized Financial Instruments, Derivatives	$ 418	$ 1,478
Gross Amounts Offset in the Statements of Financial Position, Derivatives	(333)	(1,475)
Net Amounts Presented in the Statements of Financial Position, Derivatives	85	3
Financial Instruments/Collateral, Derivatives	(85)	0
Net Amount, Derivatives	0	3
Offsetting of Financial Liabilities:
Gross Amounts of Recognized Financial Instruments, Derivatives		1,368
Gross Amounts Offset in the Statements of Financial Position, Derivatives		(1,154)
Net Amounts Presented in the Statements of Financial Position, Derivatives		215
Financial Instruments/Collateral, Derivatives		(215)
Net Amount, Derivatives		0
Gross Amounts of Recognized Financial Instruments, Total Liabilities		1,243
Gross Amounts Offset in the Statements of Financial Position, Total Liabilities		625
Net Amounts Presented in the Statements of Financial Position, Total Liabilities		618
Financial Instruments/Collateral, Total Liabilities		414
Net Amount, Total Liabilities		204
Repurchase agreements
Offsetting of Financial Liabilities:
Gross Amounts of Recognized Financial Instruments, Derivatives		311
Gross Amounts Offset in the Statements of Financial Position, Derivatives		0
Net Amounts Presented in the Statements of Financial Position, Derivatives		311
Financial Instruments/Collateral, Derivatives		(311)
Net Amount, Derivatives		0
Securities lending transactions
Offsetting of Financial Liabilities:
Gross Amounts of Recognized Financial Instruments, Derivatives		106
Gross Amounts Offset in the Statements of Financial Position, Derivatives		0
Net Amounts Presented in the Statements of Financial Position, Derivatives		106
Financial Instruments/Collateral, Derivatives		(103)
Net Amount, Derivatives		3
Retained Business
Offsetting of Financial Assets:
Gross Amounts of Recognized Financial Instruments, Derivatives	183
Gross Amounts Offset in the Statements of Financial Position, Derivatives	(98)
Net Amounts Presented in the Statements of Financial Position, Derivatives	85
Financial Instruments/Collateral, Derivatives	(85)
Net Amount, Derivatives	0
Retained Business | Derivatives
Offsetting of Financial Liabilities:
Gross Amounts of Recognized Financial Instruments, Derivatives		353
Gross Amounts Offset in the Statements of Financial Position, Derivatives		(353)
Net Amounts Presented in the Statements of Financial Position, Derivatives		0
Financial Instruments/Collateral, Derivatives		0
Net Amount, Derivatives		0
Ceded Business
Offsetting of Financial Assets:
Gross Amounts of Recognized Financial Instruments, Derivatives	235
Gross Amounts Offset in the Statements of Financial Position, Derivatives	(235)
Net Amounts Presented in the Statements of Financial Position, Derivatives	0
Financial Instruments/Collateral, Derivatives	0
Net Amount, Derivatives	$ 0
Ceded Business | Derivatives
Offsetting of Financial Liabilities:
Gross Amounts of Recognized Financial Instruments, Derivatives		473
Gross Amounts Offset in the Statements of Financial Position, Derivatives		(272)
Net Amounts Presented in the Statements of Financial Position, Derivatives		201
Financial Instruments/Collateral, Derivatives		0
Net Amount, Derivatives		$ 201