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DEBT - Credit Facility Utilization (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2015
Debt Instrument [Line Items]    
Line of credit facility, maximum borrowing capacity   $ 800
Senior Revolving Credit Facility B    
Debt Instrument [Line Items]    
Line of credit facility, maximum borrowing capacity $ 800  
Long-term line of credit 0  
Letters of credit outstanding, amount 9  
Line of credit facility, current borrowing capacity 791  
Letter Of Credit Under Receivables Purchase Agreement    
Debt Instrument [Line Items]    
Line of credit facility, maximum borrowing capacity 250  
Long-term line of credit 133  
Letters of credit outstanding, amount 2  
Line of credit facility, current borrowing capacity $ 115