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FINANCIAL INSTRUMENTS - Fair Values of Derivatives (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Derivatives, Fair Value [Line Items]    
Derivative assets $ 107 $ 98
Derivative liabilities 122 108
Derivatives designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Derivative assets 89 73
Derivative liabilities 93 70
Derivatives designated as hedging instruments | Interest rate derivatives    
Derivatives, Fair Value [Line Items]    
Derivative assets 55 21
Derivative liabilities 41 29
Derivatives designated as hedging instruments | Foreign currency contracts    
Derivatives, Fair Value [Line Items]    
Derivative assets 34 52
Derivative liabilities 52 41
Derivatives not designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Derivative assets 18 25
Derivative liabilities 29 38
Derivatives not designated as hedging instruments | Interest rate derivatives    
Derivatives, Fair Value [Line Items]    
Derivative assets 1 1
Derivative liabilities 1 0
Derivatives not designated as hedging instruments | Foreign currency contracts    
Derivatives, Fair Value [Line Items]    
Derivative assets 17 24
Derivative liabilities $ 28 $ 38