Receivables (Tables)

12 Months Ended

Dec. 31, 2021

Financing Receivable, Allowance for Credit Loss [Line Items]

Rollforward of Allowance for Bad Debts

The table below presents a rollforward of our allowance for credit losses for 2019, 2020 and 2021.

	Millions of dollars	Balance at Beginning of Period		Provision (a)		Other (b)		Balance at End of Period (c)
	Year ended December 31, 2019	$	738	$	50	$	(12)	$	776
	Year ended December 31, 2020	776		58		(10)		824
	Year ended December 31, 2021	824		(19)		(51)		754
(a)	Represents increases to allowance for credit losses charged to costs and expenses, net of recoveries.
(b)	Includes write-offs, balance sheet reclassifications, and other activity.
(c)	The allowance for credit losses in all years is primarily comprised of a full reserve against accounts receivable with our primary customer in Venezuela.