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LINES OF CREDIT - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Line of Credit Facility [Line Items]      
Line of credit, maximum borrowing capacity   $ 1,500  
Line of Credit Facility, Expiration Date Mar. 31, 2022    
Line of credit, amount outstanding $ 425    
Line of Credit Facility, Remaining Borrowing Capacity 1,075    
Compensating balance requirments for our letters of credit $ 6    
Prior Credit Facility      
Line of Credit Facility [Line Items]      
Line of credit, maximum borrowing capacity     $ 1,000
Line of Credit Facility, Expiration Date   Sep. 30, 2018