ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 23,690	$ 23,420
Other comprehensive income (loss) before reclassifications	500	(1,568)
Amounts reclassified to the Consolidated Statements of Operations	117	(25)
Total other comprehensive income (loss), net of income taxes	617	(1,593)
Ending balance	24,201	22,074
Total AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(4,560)	(665)
Total other comprehensive income (loss), net of income taxes	617	(1,593)
Ending balance	(3,943)	(2,258)
Net Unrealized Gains (Losses) on Derivatives
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,416)	(161)
Other comprehensive income (loss) before reclassifications	173	(491)
Amounts reclassified to the Consolidated Statements of Operations	94	(24)
Total other comprehensive income (loss), net of income taxes	267	(515)
Ending balance	(1,149)	(676)
Net Unrealized Gains (Losses) on Debt Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(2,771)	(156)
Other comprehensive income (loss) before reclassifications	327	(1,077)
Amounts reclassified to the Consolidated Statements of Operations	20	(3)
Total other comprehensive income (loss), net of income taxes	347	(1,080)
Ending balance	(2,424)	(1,236)
Employee Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(373)	(348)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified to the Consolidated Statements of Operations	3	2
Total other comprehensive income (loss), net of income taxes	3	2
Ending balance	$ (370)	$ (346)