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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Debt (Details) - USD ($)
$ in Millions
1 Months Ended
Oct. 31, 2018
Sep. 30, 2018
Revolving Credit Facility Expiring October 2021    
Debt    
Maximum borrowing capacity   $ 1,500
Revolving Credit Facility Expiring October 2023    
Debt    
Maximum borrowing capacity $ 1,500  
Possible additional extended term (in years) 2 years  
Maximum borrowing capacity for multi-currency loans $ 500  
Annual fee 1  
Amount of cross-default provision $ 175