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Receivables (Tables)
 12 Months Ended
Dec. 31, 2017
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 2015, 2016 and 2017.
Millions of dollars
Balance at Beginning of Period
Charged to Costs and Expenses
Write-Offs
Balance at End of Period
Year ended December 31, 2015
$
137

$
44

$
(36
)
$
145

Year ended December 31, 2016
145

50

(20
)
175

Year ended December 31, 2017
175

568

(18
)
725