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BORROWED FUNDS - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 29, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Hedging basis adjustments	$ 300		$ 693
Short-term borrowed funds	2,380		2,671
Available borrowing capacity	36,300
Federal Home Loan Bank Advances and Letters of Credit | Secured Debt
Debt Instrument [Line Items]
Short-term borrowed funds	13,800		9,400
Federal Home Loan Bank advances
Debt Instrument [Line Items]
Available borrowing capacity	3,700		8,000
Parent Company
Debt Instrument [Line Items]
Principal balance	2,000		2,300
Unamortized deferred issuance costs and/or discounts	(5)		(5)
Banking Subsidiaries
Debt Instrument [Line Items]
Principal balance	13,800		9,500
Unamortized deferred issuance costs and/or discounts	(17)		(19)
Hedging basis adjustments	$ (105)		$ (63)
5.158% fixed-to-floating rate callable subordinated debt | Parent Company | Subordinated Debt
Debt Instrument [Line Items]
Interest rate		5.158%

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