Basis of Presentation and Summary of Significant Accounting Policies Reverse Stock Split (Details) $ in Millions		12 Months Ended
	Jun. 14, 2017 shares	Dec. 31, 2017 service_offering shares	Jun. 30, 2017 USD ($)
Class of Stock [Line Items]
Bundled lease arrangements, interest rate		0.25
Number of Reporting Units | service_offering		1
Stockholders' Equity Note, Stock Split, Conversion Ratio	0.25
Common Stock, Shares Authorized		437,500,000
Common Stock [Member]
Class of Stock [Line Items]
Common Stock Shares Authorized Prior to Reverse Split	1,750,000,000
Common Stock [Member] | Reverse Stock Split [Member]
Class of Stock [Line Items]
Stockholders' Equity Note, Stock Split, Conversion Ratio	0.25
Common Stock, Shares Authorized	437,500,000
Common Stock Reclassed to Additional Paid-in Capital | $			$ 760