Annual report pursuant to Section 13 and 15(d)

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

v3.10.0.1
DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Management Add Info (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 59  
Notional Value $ 4,877 $ 8,375
Average Maturity (years) 2 years 7 months 6 days 2 years 6 months
Fair Value $ 2 $ (99)
Weighted-Average Rate Receive 2.24%
Weighted-Average Rate Pay 2.54%
Asset conversion swaps - Receive Fixed - Generic    
Derivative [Line Items]    
Notional Value $ 12  
Average Maturity (years) 1 year 2 months  
Fair Value $ 0  
Weighted-Average Rate Receive 2.20%  
Weighted-Average Rate Pay 2.46%  
Liability conversion swaps Receive Fixed Generic    
Derivative [Line Items]    
Notional Value $ 4,865 $ 8,375
Average Maturity (years) 2 years 7 months 6 days 2 years 6 months
Fair Value $ 2 $ (99)
Weighted-Average Rate Receive 2.24% 1.56%
Weighted-Average Rate Pay 2.54% 1.44%
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 | 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  
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 (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 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 $ 41