Segment Information - Revenue by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 5,847	$ 5,258	$ 16,704	$ 18,069
Operating Segments
Segment Reporting Information [Line Items]
Revenue	5,847	5,258	16,704	18,069
Operating Segments | North America
Segment Reporting Information [Line Items]
Revenue	1,129	1,034	3,185	4,311
Operating Segments | Latin America
Segment Reporting Information [Line Items]
Revenue	1,160	828	3,255	2,503
Operating Segments | Europe/CIS/Africa
Segment Reporting Information [Line Items]
Revenue	1,481	1,397	4,190	4,597
Operating Segments | Middle East & Asia
Segment Reporting Information [Line Items]
Revenue	2,034	1,986	5,952	6,559
Eliminations & other
Segment Reporting Information [Line Items]
Revenue	$ 43	$ 13	$ 122	$ 99