DERIVATIVES AND HEDGING ACTIVITIES - Schedule of the Components of AOCI Related to Hedging Activities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 7,122	$ 7,187	$ 6,696	$ 6,956
Total other comprehensive income (loss), net of tax	1	(1)	4	(4)
Ending balance	7,208	6,574	7,208	6,574
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	(3)	(3)	0
Ending balance	1	(4)	1	(4)
Foreign currency translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income (loss) before reclassifications	1	0	1	0
Total other comprehensive income (loss), net of tax	1	0	1	0
Hedging instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income (loss) before reclassifications	0	(1)	0	(4)
Reclassification adjustment for net gains included in net interest revenues, net of tax	0	0	3	0
Total other comprehensive income (loss), net of tax	$ 0	$ (1)	$ 3	$ (4)