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Accounting Policies Property, Plant and Equipment (Details) | 12 Months Ended
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Dec. 31, 2012
Building and Pipeline Imprvements [Member] |
Property, Plant and Equipment, Estimated Useful Lives | 15-40
Pipelines and terminals [Member] |
Property, Plant and Equipment, Estimated Useful Lives | 15-40
Asset Retirement Obligation Costs [Member] |
Property, Plant and Equipment, Estimated Useful Lives | 15-50
Other Machinery and Equipment [Member] |
Property, Plant and Equipment, Estimated Useful Lives | 3-15

X
- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2155824 + Details
Name: | us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration