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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
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