Rosetta Merger - Pro Forma Information (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2016	[1]	Jun. 30, 2015	Jun. 30, 2016	[1]	Jun. 30, 2015
Business Combinations [Abstract]
Revenues	$ 847,000,000		$ 881,000,000	$ 1,571,000,000		$ 1,773,000,000
Net Loss	$ (315,000,000)		$ (125,000,000)	$ (602)		$ (145,000,000)
Loss per share
Basic (in dollars per share)	$ (0.73)		$ (0.29)	$ (1.40)		$ (0.35)
Diluted (in dollars per share)	$ (0.73)		$ (0.29)	$ (1.40)		$ (0.35)

[1] No pro forma adjustments were made for the period as the acquisition is included in the Company's historical results.