ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 23,420	$ 22,673	$ 22,201
Other comprehensive income (loss) before reclassifications	(3,985)	(577)	479
Amounts reclassified to the Consolidated Statements of Operations	90	(28)	(128)
Total other comprehensive income (loss), net of income taxes	(3,895)	(605)	351
Ending balance	23,690	23,420	22,673
Total AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(665)	(60)	(411)
Total other comprehensive income (loss), net of income taxes	(3,895)	(605)	351
Ending balance	(4,560)	(665)	(60)
Net Unrealized Gains (Losses) on Derivatives
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(161)	(11)	3
Other comprehensive income (loss) before reclassifications	(1,340)	(49)	97
Amounts reclassified to the Consolidated Statements of Operations	85	(101)	(111)
Total other comprehensive income (loss), net of income taxes	(1,255)	(150)	(14)
Ending balance	(1,416)	(161)	(11)
Net Unrealized Gains (Losses) on Debt Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(156)	380	1
Other comprehensive income (loss) before reclassifications	(2,608)	(528)	382
Amounts reclassified to the Consolidated Statements of Operations	(7)	(8)	(3)
Total other comprehensive income (loss), net of income taxes	(2,615)	(536)	379
Ending balance	(2,771)	(156)	380
Employee Benefit Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(348)	(429)	(415)
Other comprehensive income (loss) before reclassifications	(37)	0	0
Amounts reclassified to the Consolidated Statements of Operations	12	81	(14)
Total other comprehensive income (loss), net of income taxes	(25)	81	(14)
Ending balance	$ (373)	$ (348)	$ (429)