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Receivables (Tables) | 12 Months Ended
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Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items] |
Rollforward of Allowance for Bad Debts | The table below presents a rollforward of our global allowance for credit losses for 2018, 2019 and 2020.
Millions of dollars | Balance at Beginning of Period | Provision (a) | Other (b) | Balance at End of Period (c)
Year ended December 31, 2018 | $ | 725 |  | $ | 57 |  | $ | (44) |  | $ | 738 |
Year ended December 31, 2019 | 738 | 50 | (12) |  | 776
Year ended December 31, 2020 | 776 | 58 | (10) |  | 824
(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.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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