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Segment Information - Revenue by Geographic Area (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenue	$ 32,815	$ 30,440	$ 27,810
Operating Segments
Segment Reporting Information [Line Items]
Revenue	32,815	30,440	27,810
Operating Segments | North America
Segment Reporting Information [Line Items]
Revenue	11,984	9,487	6,665
Operating Segments | Latin America
Segment Reporting Information [Line Items]
Revenue	3,745	3,976	4,230
Operating Segments | Europe/CIS/Africa
Segment Reporting Information [Line Items]
Revenue	7,158	7,072	7,373
Operating Segments | Middle East & Asia
Segment Reporting Information [Line Items]
Revenue	9,543	9,394	9,264
Eliminations & other
Segment Reporting Information [Line Items]
Revenue	$ 385	$ 511	$ 278

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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