Annual report pursuant to Section 13 and 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Gross Notional Values of Derivatives (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Gross Notional Values of Derivatives (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Derivative [Line Items]    
Total notional value $ 4,877 $ 8,375
Fair Value Hedges    
Derivative [Line Items]    
Total notional value 4,865 8,375
Cash Flow Hedges    
Derivative [Line Items]    
Total notional value 12 0
Securities Investment [Member]    
Derivative [Line Items]    
Total notional value 12  
Securities Investment [Member] | Fair Value Hedges    
Derivative [Line Items]    
Total notional value 0  
Securities Investment [Member] | Cash Flow Hedges    
Derivative [Line Items]    
Total notional value 12  
Other long term debt [Member]    
Derivative [Line Items]    
Total notional value 4,865 8,375
Other long term debt [Member] | Fair Value Hedges    
Derivative [Line Items]    
Total notional value 4,865 8,375
Other long term debt [Member] | Cash Flow Hedges    
Derivative [Line Items]    
Total notional value $ 0 $ 0