Property, Plant and Equipment Property, Plant and Equipment (Policies)	3 Months Ended
Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Interest capitalization policy	We capitalize interest as part of the cost of major projects during the construction period.

Disclosure of accounting policy for interest capitalization.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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