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Commitments and Contingencies (Details 5) (Texas New Mexico pipeline assets purchased from Link, USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2004
Texas New Mexico pipeline assets purchased from Link |  |
Environmental remediation disclosures |  |
Environmental reserve recognized |  | $ 20
Amount of first costs for environmental remediation costs to be born by reporting entity per acquisition agreement |  | 11
Description of first costs for environmental remediation costs to be born by reporting entity per acquisition agreement |  | we agreed in an arrangement with TNM to bear the first $11 million in costs of pre-May 1999 environmental issues
Amount of environmental remediation costs above which the costs the selling entity agreed to pay all costs |  | 20
Remediation costs incurred since acquisition of a business | 24 |
Environmental remediation costs borne by the seller of a business acquired by the reporting entity | $ 13 |

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- Definition The dollar amount of environmental remediation costs related to a business acquisition above which the costs will be borne by the selling entity, as stated in the business acquisition agreement. + References No definition available. + Details
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- Definition Represents the share of the environmental remediation costs borne by the seller of a business that was acquired by the reporting entity. + References No definition available. + Details
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- Definition The amount of acquisition-to-date environmental remediation costs incurred by the reporting entity related to a business that was acquired. + References No definition available. + Details
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- Definition Recorded amount of the accrual for a material component of an environmental loss contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=6572457&loc=d3e149879-122751 + Details
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- Definition The Increase or Decrease in the accrual for environmental loss contingencies in the period arising from business acquisitions or divestitures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=6572457&loc=d3e149879-122751 + Details
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- Definition Description of the material components comprising environmental loss contingencies, which arose from improper operations by the current or prior site owner or operator. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=6572457&loc=d3e149879-122751 + Details
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