Revenues - Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Total Product and Service Revenue before Rental Revenues		$ 1,341
Rental Revenues	$ 78	82
Total Revenues	1,346	1,423
Western Hemisphere
Disaggregation of Revenue [Line Items]
Total Product and Service Revenue before Rental Revenues	669	700
Western Hemisphere | United States
Disaggregation of Revenue [Line Items]
Total Product and Service Revenue before Rental Revenues	329	345
Western Hemisphere | Latin America
Disaggregation of Revenue [Line Items]
Total Product and Service Revenue before Rental Revenues	258	226
Western Hemisphere | Canada
Disaggregation of Revenue [Line Items]
Total Product and Service Revenue before Rental Revenues	82	129
Eastern Hemisphere
Disaggregation of Revenue [Line Items]
Total Product and Service Revenue before Rental Revenues	599	641
Eastern Hemisphere | Middle East and North Africa
Disaggregation of Revenue [Line Items]
Total Product and Service Revenue before Rental Revenues	308	362
Eastern Hemisphere | Europe, Sub-Sahara Africa, Russia
Disaggregation of Revenue [Line Items]
Total Product and Service Revenue before Rental Revenues	216	214
Eastern Hemisphere | Asia
Disaggregation of Revenue [Line Items]
Total Product and Service Revenue before Rental Revenues	75	$ 65
Combined Company Segment 606 Revenue [Member]
Disaggregation of Revenue [Line Items]
Total Product and Service Revenue before Rental Revenues	$ 1,268