Segment Information - Revenue by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenue	$ 5,258	$ 8,541	$ 18,069	$ 24,689
Operating Segments
Segment Reporting Information [Line Items]
Revenue	5,258	8,541	18,069	24,689
Operating Segments \| North America
Segment Reporting Information [Line Items]
Revenue	1,157	2,850	4,620	8,389
Operating Segments \| Latin America
Segment Reporting Information [Line Items]
Revenue	707	1,014	2,195	3,121
Operating Segments \| Europe/CIS/Africa
Segment Reporting Information [Line Items]
Revenue	1,397	2,062	4,597	5,665
Operating Segments \| Middle East & Asia
Segment Reporting Information [Line Items]
Revenue	1,987	2,553	6,559	7,343
Eliminations & other
Segment Reporting Information [Line Items]
Revenue	$ 10	$ 62	$ 98	$ 171

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ Details