Segment Information Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net	$ 1,406	$ 1,356	$ 1,402	$ 1,585	$ 2,012	$ 2,237	$ 2,390	$ 2,794	$ 5,749	$ 9,433	$ 14,911
Long-lived Assets	4,629				5,831				4,629	5,831
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net									1,523	2,864	5,567
Long-lived Assets	1,008				1,478				1,008	1,478
Middle East and North Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net									1,513	1,843	2,038
Long-lived Assets	1,595				1,686				1,595	1,686
Latin America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net									1,064	1,782	2,381
Long-lived Assets	903				1,143				903	1,143
Europe/Sub-Sahara Africa/Russia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net									939	1,613	2,584
Long-lived Assets	629				862				629	862
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net									355	701	1,057
Long-lived Assets	354				471				354	471
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net									355	630	$ 1,284
Long-lived Assets	$ 140				$ 191				$ 140	$ 191