VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Dec. 31, 2019

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

VALUATION AND QUALIFYING ACCOUNTS

VALUATION AND QUALIFYING ACCOUNTS

Accounts receivable allowances primarily represent adjustments to customer billings that are estimated when the related revenue is recognized and also represents an estimate for uncollectible accounts. The valuation allowance on deferred tax assets relates to foreign net operating tax losses for which realization is uncertain. Below is a summary of activity:

Year Ended December 31,	Balance at Beginning of the Year		Charged to costs and expenses		Deductions (1)		Balance at End of the Year
2019
Accounts receivable allowance	$	(43)	$	(11)	$	11	$	(43)
Deferred tax assets—valuation allowance	$	(5)	$	(4)	$	—	$	(9)
2018
Accounts receivable allowance	$	(37)	$	(18)	$	12	$	(43)
Deferred tax assets—valuation allowance	$	(6)	$	—	$	1	$	(5)
2017
Accounts receivable allowance	$	(26)	$	(20)	$	9	$	(37)
Deferred tax assets—valuation allowance	$	(3)	$	(3)	$	—	$	(6)

⁽¹⁾Reflects write-off of uncollectible accounts receivable or expiration of foreign net operating tax losses.