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BORROWED FUNDS - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Short-term borrowed funds	$ 8	$ 243
Hedging basis adjustments	2,098	2,153
Available borrowing capacity	63,600
Federal Home Loan Bank Advances and Letters of Credit | Secured Debt
Debt Instrument [Line Items]
Short-term borrowed funds	2,200	3,200
Federal Home Loan Bank advances
Debt Instrument [Line Items]
Available borrowing capacity	15,100	13,900
Parent Company
Debt Instrument [Line Items]
Principal balance	3,200	3,500
Unamortized deferred issuance costs and/or discounts	(82)	(90)
Banking Subsidiaries
Debt Instrument [Line Items]
Principal balance	3,800	4,800
Unamortized deferred issuance costs and/or discounts	(8)	(11)
Hedging basis adjustments	$ 63	$ 112

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