DERIVATIVES - Effect of Customer Derivatives and Economic Hedges on Net Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Amounts recognized in noninterest income	$ 86	$ 15	$ 201	$ (93)
Economic hedges | Customer interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amounts recognized in noninterest income	$ (840)	$ (10)	$ (2,015)	$ (225)
Derivative, gain (loss), statement of income or comprehensive income	Foreign exchange and derivative products	Foreign exchange and derivative products	Foreign exchange and derivative products	Foreign exchange and derivative products
Economic hedges | Derivatives hedging interest rate risk
Derivative Instruments, Gain (Loss) [Line Items]
Amounts recognized in noninterest income	$ 852	$ 17	$ 2,073	$ 244
Derivative, gain (loss), statement of income or comprehensive income	Foreign exchange and derivative products	Foreign exchange and derivative products	Foreign exchange and derivative products	Foreign exchange and derivative products
Economic hedges | Customer foreign exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amounts recognized in noninterest income	$ (174)	$ (61)	$ (297)	$ (158)
Derivative, gain (loss), statement of income or comprehensive income	Foreign exchange and derivative products	Foreign exchange and derivative products	Foreign exchange and derivative products	Foreign exchange and derivative products
Economic hedges | Derivatives hedging foreign exchange risk
Derivative Instruments, Gain (Loss) [Line Items]
Amounts recognized in noninterest income	$ 271	$ 95	$ 520	$ 234
Derivative, gain (loss), statement of income or comprehensive income	Foreign exchange and derivative products	Foreign exchange and derivative products	Foreign exchange and derivative products	Foreign exchange and derivative products
Economic hedges | Customer commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amounts recognized in noninterest income	$ (71)	$ 468	$ 1,453	$ 881
Derivative, gain (loss), statement of income or comprehensive income	Foreign exchange and derivative products	Foreign exchange and derivative products	Foreign exchange and derivative products	Foreign exchange and derivative products
Economic hedges | Derivatives hedging commodity price risk
Derivative Instruments, Gain (Loss) [Line Items]
Amounts recognized in noninterest income	$ 77	$ (465)	$ (1,436)	$ (874)
Derivative, gain (loss), statement of income or comprehensive income	Foreign exchange and derivative products	Foreign exchange and derivative products	Foreign exchange and derivative products	Foreign exchange and derivative products
Economic hedges | Residential loan commitments
Derivative Instruments, Gain (Loss) [Line Items]
Amounts recognized in noninterest income	$ (66)	$ (13)	$ (289)	$ (184)
Derivative, gain (loss), statement of income or comprehensive income	Mortgage banking fees	Mortgage banking fees	Mortgage banking fees	Mortgage banking fees
Economic hedges | Derivatives hedging residential loan commitments and mortgage loans held for sale, at fair value
Derivative Instruments, Gain (Loss) [Line Items]
Amounts recognized in noninterest income	$ 105	$ 4	$ 502	$ 138
Derivative, gain (loss), statement of income or comprehensive income	Mortgage banking fees	Mortgage banking fees	Mortgage banking fees	Mortgage banking fees
Economic hedges | Derivative contracts used to hedge residential MSRs
Derivative Instruments, Gain (Loss) [Line Items]
Amounts recognized in noninterest income	$ (68)	$ (20)	$ (310)	$ (149)
Derivative, gain (loss), statement of income or comprehensive income	Mortgage banking fees	Mortgage banking fees	Mortgage banking fees	Mortgage banking fees