DERIVATIVES AND HEDGING - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Offsetting of Financial Assets:
Gross Amounts of Recognized Financial Instruments	$ 380	$ 418
Gross Amounts Offset in the Statements of Financial Position	(101)	(333)
Net Amounts Presented in the Statements of Financial Position	279	85
Financial Instruments/Collateral	(156)	(85)
Net Amount	123	0
Derivative instruments
Offsetting of Financial Liabilities:
Gross Amounts of Recognized Financial Instruments	400	826
Gross Amounts Offset in the Statements of Financial Position	(400)	(625)
Net Amounts Presented in the Statements of Financial Position	0	201
Financial Instruments/Collateral	0	0
Net Amount	0	201
Repurchase Agreements
Offsetting of Financial Liabilities:
Gross Amounts of Recognized Financial Instruments	403	311
Gross Amounts Offset in the Statements of Financial Position	0	0
Net Amounts Presented in the Statements of Financial Position	403	311
Financial Instruments/Collateral	(403)	(311)
Net Amount	0	0
Securities Lending Transaction
Offsetting of Financial Liabilities:
Gross Amounts of Recognized Financial Instruments		106
Gross Amounts Offset in the Statements of Financial Position		0
Net Amounts Presented in the Statements of Financial Position		106
Financial Instruments/Collateral		(103)
Net Amount		3
Retained Business
Offsetting of Financial Assets:
Gross Amounts of Recognized Financial Instruments	156	183
Gross Amounts Offset in the Statements of Financial Position	0	(98)
Net Amounts Presented in the Statements of Financial Position	156	85
Financial Instruments/Collateral	(156)	(85)
Net Amount	0	0
Retained Business | Derivative instruments
Offsetting of Financial Liabilities:
Gross Amounts of Recognized Financial Instruments	299	353
Gross Amounts Offset in the Statements of Financial Position	(299)	(353)
Net Amounts Presented in the Statements of Financial Position	0	0
Financial Instruments/Collateral	0	0
Net Amount	0	0
Ceded Business
Offsetting of Financial Assets:
Gross Amounts of Recognized Financial Instruments	224	235
Gross Amounts Offset in the Statements of Financial Position	(101)	(235)
Net Amounts Presented in the Statements of Financial Position	123	0
Financial Instruments/Collateral	0	0
Net Amount	123	0
Ceded Business | Derivative instruments
Offsetting of Financial Liabilities:
Gross Amounts of Recognized Financial Instruments	101	473
Gross Amounts Offset in the Statements of Financial Position	(101)	(272)
Net Amounts Presented in the Statements of Financial Position	0	201
Financial Instruments/Collateral	0	0
Net Amount	$ 0	$ 201