Net Loss Per Share (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended		18 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Dec. 31, 2016
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computation of diluted earnings per share (in shares)				2,664,000
Non-Employee Directors' Deferred Fee Plan and Equity Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares		155,616
Shares excluded from the computation of diluted earnings per share (in shares)			108,827
Expense recognized during the period		$ (3)	$ 1
Series A Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computation of diluted earnings per share (in shares)	19,250,000	19,250,000
Preferred Stock, Shares Outstanding	19,250,000	19,250,000		19,250,000	19,250,000