Annual report pursuant to Section 13 and 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Management Add Info (Details)

v3.19.3.a.u2
DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Management Add Info (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]    
Notional Value $ 16,177 $ 4,877
Average Maturity (years)   2 years 7 months 6 days
Fair Value 174 $ 2
Purchase of interest rate caps and derivative financial instruments, notional value $ 25,927 $ 4,877
Weighted-Average Rate Receive   2.24%
Weighted-Average Rate Pay   2.54%
Interest Rate Floor [Member]    
Derivative [Line Items]    
Derivative, Average Remaining Maturity 1 year 7 months 6 days  
Fair Value $ 46  
Purchase of interest rate caps and derivative financial instruments, notional value $ 9,750  
Asset conversion swaps - Receive Fixed - Generic    
Derivative [Line Items]    
Derivative, Average Remaining Maturity 3 years 3 months 18 days  
Notional Value $ 8,637 $ 12
Average Maturity (years)   1 year 2 months 12 days
Fair Value $ 23 $ 0
Weighted-Average Rate Receive 1.66% 2.20%
Weighted-Average Rate Pay 1.06% 2.46%
Liability conversion swaps Receive Fixed Generic    
Derivative [Line Items]    
Derivative, Average Remaining Maturity 2 years 3 months 18 days  
Notional Value $ 7,540 $ 4,865
Average Maturity (years)   2 years 7 months 6 days
Fair Value $ 151 $ 2
Weighted-Average Rate Receive 2.20% 2.24%
Weighted-Average Rate Pay 1.79% 2.54%
Interest Rate Swap [Member]    
Derivative [Line Items]    
Derivative, Average Remaining Maturity 2 years 10 months 24 days  
Weighted-Average Rate Receive 1.91%  
Weighted-Average Rate Pay 1.40%  
Other Contract [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Mortgage banking income  
Foreign Exchange Contract [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Capital markets fees  
Commodity Contract [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Capital markets fees  
Equity Contract [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Other noninterest expense  
Customer Contracts [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Purpose Capital markets fees  
Fair Value Hedges    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value $ 7,540 $ 4,865
Fair Value Hedges | Not Designated as Hedging Instrument [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 112 59
Fair Value Hedges | Not Designated as Hedging Instrument [Member] | Other Expense [Member] | Equity Contract [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (4) 4
Fair Value Hedges | Not Designated as Hedging Instrument [Member] | Mortgage banking income | Interest Rate Contract    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 37 (19)
Fair Value Hedges | Not Designated as Hedging Instrument [Member] | Capital markets fees [Domain] | Commodity Contract [Member]    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (2) 6
Fair Value Hedges | Not Designated as Hedging Instrument [Member] | Capital markets fees [Domain] | Interest Rate Contract    
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 49 41
Cash Flow Hedging [Member]    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 18,387 12
Loans Payable [Member]    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 18,375  
Loans Payable [Member] | Fair Value Hedges    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 0  
Loans Payable [Member] | Cash Flow Hedging [Member]    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value $ 18,375  
Assigned [Member] | Interest Rate Floor [Member]    
Derivative [Line Items]    
Derivative, Average Remaining Maturity 1 year 7 months 6 days  
Fair Value $ 46  
Purchase of interest rate caps and derivative financial instruments, notional value 9,750  
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 Hedging [Member]    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 12 12
Other long term debt [Member]    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value 7,540 4,865
Other long term debt [Member] | 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 [Member] | Cash Flow Hedging [Member]    
Derivative [Line Items]    
Purchase of interest rate caps and derivative financial instruments, notional value $ 0 $ 0