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Receivables (Tables) | 12 Months Ended
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Dec. 31, 2019
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 bad debts for 2017, 2018 and 2019.
Millions of dollars | Balance at Beginning of Period | Provision (a) | Other (b) | Balance at End of Period (c)
Year ended December 31, 2017 | $ | 175 |  | $ | 566 |  | $ | (16 | ) | $ | 725 |
Year ended December 31, 2018 | 725 |  | 57 |  | (44 | ) | 738 |
Year ended December 31, 2019 | 738 |  | 50 |  | (12 | ) | 776 |
(a) Represents increases to allowance for bad debts charged to costs and expenses, net of recoveries. (b) Includes write-offs, balance sheet reclassifications, and other activity. (c) The allowance for bad debts 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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