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FINANCIAL ASSETS AND LIABILITIES - Derivatives under hedge accounting (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Derivatives under hedge accounting    
Fair value of assets $ 1,164 $ 496
Fair value of liabilities 12,110 11,570
Derivatives designated as cash flow hedges | Interest rate exchange contracts    
Derivatives under hedge accounting    
Nominal value 93 158
Fair value of liabilities 1 3
Derivatives designated as cash flow hedges | Foreign exchange contracts    
Derivatives under hedge accounting    
Nominal value   73
Fair value of liabilities   4
Net investment hedge accounting | Cross currency interest rate exchange contracts    
Derivatives under hedge accounting    
Nominal value 600  
Fair value of liabilities 59  
Not Designated as Hedging | Foreign exchange contracts    
Derivatives under hedge accounting    
Nominal value 283 407
Fair value of assets $ 5 2
Fair value of liabilities   29
Not Designated as Hedging | Cross currency interest rate exchange contracts    
Derivatives under hedge accounting    
Nominal value   $ 7