Contingencies and Commitments (Unaudited) Environmental Obligation (Details) $ in Millions	Jun. 30, 2018 USD ($)
Cyprus Tohono [Member]
Environmental Exit Cost [Line Items]
Environmental Costs Recognized, Capitalized	$ 44

Amount of costs recognized in the balance sheet for known or estimated future costs arising from requirements to perform activities to remediate one or more sites.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 25
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=39739230&loc=d3e11660-110855

Name:	us-gaap_EnvironmentalCostsRecognizedCapitalized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant