Segment Information - Revenue by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 5,634	$ 5,356	$ 10,857	$ 12,811
Operating Segments
Segment Reporting Information [Line Items]
Revenue	5,634	5,356	10,857	12,811
Operating Segments | North America
Segment Reporting Information [Line Items]
Revenue	1,083	1,097	2,055	3,277
Operating Segments | Latin America
Segment Reporting Information [Line Items]
Revenue	1,057	629	2,095	1,675
Operating Segments | Europe/CIS/Africa
Segment Reporting Information [Line Items]
Revenue	1,453	1,449	2,709	3,201
Operating Segments | Middle East & Asia
Segment Reporting Information [Line Items]
Revenue	2,001	2,146	3,918	4,573
Eliminations & other
Segment Reporting Information [Line Items]
Revenue	$ 40	$ 35	$ 80	$ 85