Segment Information - Revenue by Geographic Area (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 32,917	$ 32,815	$ 30,440
Operating Segments
Segment Reporting Information [Line Items]
Revenue	32,917	32,815	30,440
Operating Segments | North America
Segment Reporting Information [Line Items]
Revenue	10,843	11,984	9,487
Operating Segments | Latin America
Segment Reporting Information [Line Items]
Revenue	4,149	3,745	3,976
Operating Segments | Europe/CIS/Africa
Segment Reporting Information [Line Items]
Revenue	7,683	7,158	7,072
Operating Segments | Middle East & Asia
Segment Reporting Information [Line Items]
Revenue	10,017	9,543	9,394
Eliminations & other
Segment Reporting Information [Line Items]
Revenue	$ 225	$ 385	$ 511