Segment Information - Fixed Assets Less Accumulated Depreciation by Geographic Area (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Fixed Assets less accumulated depreciation	$ 6,826	$ 9,270
Operating Segments | North America
Segment Reporting Information [Line Items]
Fixed Assets	1,588	3,326
Operating Segments | Latin America
Segment Reporting Information [Line Items]
Fixed Assets	841	912
Operating Segments | Europe
Segment Reporting Information [Line Items]
Fixed Assets	1,840	2,309
Operating Segments | Middle East & Asia
Segment Reporting Information [Line Items]
Fixed Assets	2,353	2,502
Unallocated
Segment Reporting Information [Line Items]
Fixed Assets	$ 204	$ 221