ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 24,342	$ 23,690	$ 23,420
Other comprehensive income (loss) before reclassifications	(602)	272	(3,985)
Amounts reclassified to the Consolidated Statements of Operations	765	530	90
Total other comprehensive income (loss), net of income taxes	163	802	(3,895)
Ending balance	24,254	24,342	23,690
Total AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(3,758)	(4,560)	(665)
Total other comprehensive income (loss), net of income taxes	163	802	(3,895)
Ending balance	(3,595)	(3,758)	(4,560)
Net Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,087)	(1,416)	(161)
Other comprehensive income (loss) before reclassifications	(531)	(106)	(1,340)
Amounts reclassified to the Consolidated Statements of Operations	693	435	85
Total other comprehensive income (loss), net of income taxes	162	329	(1,255)
Ending balance	(925)	(1,087)	(1,416)
Net Unrealized Gains (Losses) on Investment Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(2,338)	(2,771)	(156)
Other comprehensive income (loss) before reclassifications	(90)	350	(2,608)
Amounts reclassified to the Consolidated Statements of Operations	59	83	(7)
Total other comprehensive income (loss), net of income taxes	(31)	433	(2,615)
Ending balance	(2,369)	(2,338)	(2,771)
Defined Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(333)	(373)	(348)
Other comprehensive income (loss) before reclassifications	19	28	(37)
Amounts reclassified to the Consolidated Statements of Operations	13	12	12
Total other comprehensive income (loss), net of income taxes	32	40	(25)
Ending balance	$ (301)	$ (333)	$ (373)