Annual report pursuant to Section 13 and 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Management (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Management (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value $ 25,927 $ 4,877
Gross amounts of recognized assets 856 500
Gross amounts of recognized liabilities 521 404
Fair Value Hedges    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 7,540 4,865
Cash Flow Hedges    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 18,387 12
Loans    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 18,375  
Loans | Fair Value Hedges    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 0  
Loans | Cash Flow Hedges    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 18,375  
Securities Investment [Member]    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 12 12
Securities Investment [Member] | Fair Value Hedges    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 0 0
Securities Investment [Member] | Cash Flow Hedges    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 12 12
Other long-term debt    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 7,540 4,865
Other long-term debt | Fair Value Hedges    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 7,540 4,865
Other long-term debt | Cash Flow Hedges    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 0 0
Accrued income and other assets    
Derivative [Line Items]    
Interest Rate Fair Value Hedge Asset at Fair Value 256 44
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 420 261
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 19 23
Price Risk Derivative Instruments Not Designated as Hedging Instruments Asset, at Fair Value 155 172
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value 6 0
Gross amounts of recognized assets 856 500
Accrued expenses and other liabilities    
Derivative [Line Items]    
Interest Rate Fair Value Hedge Liability at Fair Value 36 42
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 314 165
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 18 19
Price Risk Derivative Instruments Not Designated as Hedging Instruments Liability, at Fair Value 152 168
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value 1 10
Gross amounts of recognized liabilities 521 404
Derivative used in Mortgage Banking Activities    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 778 0
Not Designated as Hedging Instrument [Member] | Fair Value Hedges    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 112 59
Customer Contracts [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Capital markets fees  
Mortgage banking income | Not Designated as Hedging Instrument [Member] | Interest Rate Contract | Fair Value Hedges    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 37 (19)
Foreign Exchange Contract [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Capital markets fees  
Capital markets fees [Domain] | Not Designated as Hedging Instrument [Member] | Interest Rate Contract | Fair Value Hedges    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 49 41
Capital markets fees [Domain] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Fair Value Hedges    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 28 27
Capital markets fees [Domain] | Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Fair Value Hedges    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ (2) 6
Equity Contract [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Other noninterest expense  
Commodity Contract [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Capital markets fees  
Other Contract [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Mortgage banking income  
Other Expense [Member] | Not Designated as Hedging Instrument [Member] | Equity Contract [Member] | Fair Value Hedges    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ (4) $ 4
Interest Rate Floor [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Other noninterest income