REVISION OF PREVIOUSLY ISSUED FINANCIAL STATEMENTS - Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended	9 Months Ended
	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2023	Sep. 30, 2023
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)	$ (83)	$ 481	$ 51	$ 62	$ 113	$ 594
Change in market risk benefits - instrument-specific credit risk	48	(262)		4		(250)
Other comprehensive income	(5)	(404)		79		(368)
Comprehensive income (loss)	$ (88)	77	8	141	149	226
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)		516	14	63	77	593
Change in market risk benefits - instrument-specific credit risk		(280)		5		(268)
Other comprehensive income		(423)		80		(386)
Comprehensive income (loss)		93	(29)	143	114	207
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)		(35)	37	(1)	36	1
Change in market risk benefits - instrument-specific credit risk		18		(1)		18
Other comprehensive income		19		(1)		18
Comprehensive income (loss)		$ (16)	$ 37	$ (2)	$ 35	$ 19