Subsequent Events (Details) - USD ($) $ in Millions		9 Months Ended
Oct. 01, 2015	Sep. 30, 2015
Subsequent Event [Line Items]
Natural gas processing and transportation agreement		5 years
Subsequent Event
Subsequent Event [Line Items]
Proceeds from Divestiture of Interest in Consolidated Subsidiaries	$ 143
Natural gas processing and transportation agreement	15 years

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Name:	us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration