Stockholders' Equity and Noncontrolling Interests Warrants (Details) - $ / shares shares in Millions	Dec. 31, 2018	Dec. 31, 2017
Class of Warrant or Right [Line Items]
Outstanding warrants (in shares)	15	22
Second Tranche of Warrants [Member]
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)	$ 18.33

Exercise price per share or per unit of warrants or rights outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant