The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
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-Subparagraph (SX 210.7-04(19))
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Section S99
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Name:	us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Earnings Per Share (Narrative) (Details) - $ / shares shares in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income (Loss) from Continuing Operations, Per Basic Share	$ (1.03)	$ 0.22	$ 0.08	$ 0.04	$ (0.35)	$ 0.26	$ (0.15)	$ 0.21	$ (0.77)	$ (0.04)	$ 0.46
Antidilutive securities excluded from computation of earnings per share									7	8	8
Earnings Per Share, Basic	$ (2.03)	$ 0.23	$ 0.08	$ 0.04	$ (1.44)	$ 0.26	$ (0.73)	$ 0.19	$ (1.76)	$ (1.72)	$ 0.45
Convertible Debt Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share										15	15