Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Hedging Instruments (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Hedging Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 21,923 $ 33,327
Asset derivatives included in accrued income and other assets    
Total contracts 1,684 1,946
Liability derivatives included in accrued expenses and other liabilities    
Total contracts 1,048 1,033
Accrued income and other assets    
Asset derivatives included in accrued income and other assets    
Interest rate contracts not designated as hedging instruments 871 1,074
Foreign exchange contracts not designated as hedging instruments 48 46
Commodities contracts not designated as hedging instruments 214 107
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value 5 0
Total contracts 1,684 1,946
Accrued expenses and other liabilities    
Liability derivatives included in accrued expenses and other liabilities    
Interest rate contracts not designated as hedging instruments 745 828
Foreign exchange contracts not designated as hedging instruments 45 47
Commodities contracts not designated as hedging instruments 210 103
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value 6 4
Total contracts 1,048 1,033
Interest Rate Contract [Member] | Accrued income and other assets    
Asset derivatives included in accrued income and other assets    
Interest rate contracts designated as hedging instruments 541 719
Interest Rate Contract [Member] | Accrued expenses and other liabilities    
Liability derivatives included in accrued expenses and other liabilities    
Interest rate contracts designated as hedging instruments 41 51
Foreign Exchange Contract [Member] | Accrued income and other assets    
Asset derivatives included in accrued income and other assets    
Interest rate contracts designated as hedging instruments 5 0
Foreign Exchange Contract [Member] | Accrued expenses and other liabilities    
Liability derivatives included in accrued expenses and other liabilities    
Interest rate contracts designated as hedging instruments 1 0
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Accrued income and other assets    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 20,452 27,056
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Accrued income and other assets    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 220 0
Not Designated as Hedging Instrument [Member] | Accrued income and other assets    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 79,444 76,738
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Accrued income and other assets    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 53,363 44,495
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Accrued income and other assets    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 3,101 2,718
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Accrued income and other assets    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 1,614 1,952
Not Designated as Hedging Instrument [Member] | Equity Contract [Member] | Accrued income and other assets    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 694 $ 517