Segment Information - Revenue by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 7,829	$ 6,894
Operating Segments
Segment Reporting Information [Line Items]
Revenue	7,829	6,894
Operating Segments | North America
Segment Reporting Information [Line Items]
Revenue	2,835	1,871
Operating Segments | Latin America
Segment Reporting Information [Line Items]
Revenue	870	952
Operating Segments | Europe/CIS/Africa
Segment Reporting Information [Line Items]
Revenue	1,704	1,652
Operating Segments | Middle East & Asia
Segment Reporting Information [Line Items]
Revenue	2,309	2,318
Eliminations & other
Segment Reporting Information [Line Items]
Revenue	$ 111	$ 101