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Receivables (Tables) | 12 Months Ended
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Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items] |
Allowance for Credit Losses on Financing Receivables [Table Text Block] | The following table presents a rollforward of our global allowance for bad debts for 2016, 2017 and 2018.
Millions of dollars | Balance at Beginning of Period | Provision (a) | Other (b) | Balance at End of Period
Year ended December 31, 2016 | $ | 145 |  | $ | 50 |  | $ | (20 | ) | $ | 175 |
Year ended December 31, 2017 | 175 |  | 566 |  | (16 | ) | 725 |
Year ended December 31, 2018 | 725 |  | 57 |  | (44 | ) | 738 |
(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.

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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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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