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ALLOWANCE FOR DOUBTFUL ACCOUNTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
ALLOWANCE FOR DOUBTFUL ACCOUNTS [Abstract]      
Balance at beginning of period $ (29) $ (27)  
Provision for uncollectible accounts (7) (16) $ (16)
Write-off of uncollectible accounts, net of recoveries 10 17  
Business acquisitions, foreign currency and other 1 (3)  
Balance at end of period $ (25) $ (29) $ (27)