Revenues - Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Total Product and Service Revenue before Rental Revenues	$ 1,341
Rental Revenues	82
Total Revenues	1,423	$ 1,386
Western Hemisphere
Disaggregation of Revenue [Line Items]
Total Product and Service Revenue before Rental Revenues	700
Western Hemisphere | United States
Disaggregation of Revenue [Line Items]
Total Product and Service Revenue before Rental Revenues	345
Western Hemisphere | Latin America
Disaggregation of Revenue [Line Items]
Total Product and Service Revenue before Rental Revenues	226
Western Hemisphere | Canada
Disaggregation of Revenue [Line Items]
Total Product and Service Revenue before Rental Revenues	129
Eastern Hemisphere
Disaggregation of Revenue [Line Items]
Total Product and Service Revenue before Rental Revenues	641
Eastern Hemisphere | Middle East and North Africa
Disaggregation of Revenue [Line Items]
Total Product and Service Revenue before Rental Revenues	363
Eastern Hemisphere | Europe, Sub-Sahara Africa, Russia
Disaggregation of Revenue [Line Items]
Total Product and Service Revenue before Rental Revenues	222
Eastern Hemisphere | Asia
Disaggregation of Revenue [Line Items]
Total Product and Service Revenue before Rental Revenues	$ 56