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BORROWED FUNDS - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Short-term borrowed funds	$ 70	$ 243
Hedging basis adjustments	1,727	2,153
Available borrowing capacity	66,600
Federal Home Loan Bank Advances and Letters of Credit | Secured Debt
Debt Instrument [Line Items]
Short-term borrowed funds	2,800	3,200
Federal Home Loan Bank advances
Debt Instrument [Line Items]
Available borrowing capacity	14,100	13,900
Parent Company
Debt Instrument [Line Items]
Principal balance	3,500
Unamortized deferred issuance costs and/or discounts	(87)	(90)
Banking Subsidiaries
Debt Instrument [Line Items]
Principal balance	4,800
Unamortized deferred issuance costs and/or discounts	(10)	(11)
Hedging basis adjustments	$ 85	$ 112

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