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ALLOWANCE FOR DOUBTFUL ACCOUNTS
 12 Months Ended
Dec. 31, 2018
ALLOWANCE FOR DOUBTFUL ACCOUNTS [Abstract]  
ALLOWANCE FOR DOUBTFUL ACCOUNTS
ALLOWANCE FOR DOUBTFUL ACCOUNTS

The following table shows the activity in the allowance for doubtful accounts (in millions of dollars):
 
For the Years Ended December 31,
 
2018
 
2017
Balance at beginning of period
$
(29
)
 
$
(27
)
 Provision for uncollectible accounts
(7
)
 
(16
)
    Write-off of uncollectible accounts, net of recoveries
10

 
17

Foreign currency and other
1

 
(3
)
Balance at end of period
$
(25
)
 
$
(29
)