Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Description of the Business and Summary of Significant Accounting Policies - Other Information (Details) shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 shares	Jun. 30, 2017 shares	Jun. 30, 2018 Segment shares	Jun. 30, 2017 shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of business segments \| Segment			4
Stock Options
Business Acquisition [Line Items]
Anti-dilutive securities (in shares)	2.6	2.8	2.6	2.8
Restricted Stock Units
Business Acquisition [Line Items]
Anti-dilutive securities (in shares)	3.0	4.4	3.0	4.4