Annual report pursuant to Section 13 and 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Hedging instruments (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Hedging instruments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Asset derivatives included in accrued income and other assets    
Total derivative assets $ 856 $ 500
Liability derivatives included in accrued expenses and other liabilities    
Total derivative liabilities 521 404
Accrued income and other assets    
Asset derivatives included in accrued income and other assets    
Interest rate contracts designated as hedging instruments 256 44
Interest rate contracts not designated as hedging instruments 420 261
Foreign exchange contracts not designated as hedging instruments 19 23
Commodities contracts not designated as hedging instruments 155 172
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value 6 0
Total derivative assets 856 500
Accrued expenses and other liabilities    
Liability derivatives included in accrued expenses and other liabilities    
Interest rate contracts designated as hedging instruments 36 42
Interest rate contracts not designated as hedging instruments 314 165
Foreign exchange contracts not designated as hedging instruments 18 19
Commodities contracts not designated as hedging instruments 152 168
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value 1 10
Total derivative liabilities $ 521 404
Customer Contracts [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Capital markets fees  
Commodity Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Capital markets fees  
Other Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Mortgage banking income  
Interest Rate Floor [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Other noninterest income  
Equity Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Other noninterest expense  
Foreign Exchange Contract [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Capital markets fees  
Fair Value Hedging [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 112 59
Fair Value Hedging [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Capital markets fees [Domain]    
Derivatives, Fair Value [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (2) 6
Fair Value Hedging [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Capital markets fees [Domain]    
Derivatives, Fair Value [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 49 41
Fair Value Hedging [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Mortgage Banking Income [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 37 (19)
Fair Value Hedging [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Floor [Member] | Other noninterest income [Domain]    
Derivatives, Fair Value [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 4 0
Fair Value Hedging [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Capital markets fees [Domain]    
Derivatives, Fair Value [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 28 27
Fair Value Hedging [Member] | Not Designated as Hedging Instrument [Member] | Equity Contract [Member] | Other Expense [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ (4) $ 4