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BORROWED FUNDS - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Short-term borrowed funds	$ 243	$ 274
Hedging basis adjustments	2,153	984
Available borrowing capacity	64,600
FHLB advances and letters of credit | Secured Debt
Debt Instrument [Line Items]
Short-term borrowed funds	3,200	9,800
FHLB advances
Debt Instrument [Line Items]
Available borrowing capacity	13,900	7,200
Parent company
Debt Instrument [Line Items]
Principal balance	3,500	2,500
Unamortized deferred issuance costs and or discounts	(90)	(8)
Banking Subsidiaries
Debt Instrument [Line Items]
Principal balance	4,800	11,500
Unamortized deferred issuance costs and or discounts	(11)	(13)
Hedging basis adjustments	$ 112	$ 50

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