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Litigation, Environmental and Other Contingencies (Details) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Federal Energy Regulatory Commission Proceedings - SFPP [Abstract]    
Amount of years before filing that complainants can seek reparations 2  
Number of shippers included in settlement agreement on various rate challenges dating back to 1992 11  
Total number of shippers included in various rate challenges dating back to 1992 12  
Amount charged to earnings as a result of SFPP rate litigation   $ 172,000,000
Settlement payments made to shippers   206,300,000
Amount of reduction to general partner's distribution as a result of interim capital transaction   170,000,000
Increase in expense associated with overall rate case liability adjustments 165,000,000  
Approximate amount of refunds associated with compliance filing 16,000,000  
Estimated amount shippers are seeking in annual rate reductions 50,000,000  
Estimated amount shippers are seeking in refunds 140,000,000  
Federal Energy Regulatory Commission Proceedings - Trailblazer Pipeline Company LLC [Abstract]    
Amount refunded to shippers as part of Trailblazer Pipeline Company settlement 700,000  
Federal Energy Regulatory Commission Proceedings - Kinder Morgan Interstate Gas Transmission LLC Section 5 Proceeding [Abstract]    
Length of time within which the FERC has directed that an initial decision be issued for the KMIGT Section 5 proceeding (in weeks)
47 weeks
  
Percent reduction in Fuel Retention Factors billed to shippers 30.0  
California Public Utilities Commission Proceedings [Abstract]    
The number of administrative law judges handling the cases with the California Public Utilities Commission 2  
The estimated amount of potential annual rate reductions in the California Public Utilities Commission Proceedings 30,000,000  
Approximate rate reparations sought by shippers 360,000,000  
Carbon Dioxide Litigation - CO2 Claims Arbitration [Abstract]    
The number of lawsuits settled with settlement agreement on July 7, 2003 regarding the McElmo Dome carbon dioxide production 5  
Alleged amount of underpayment of royalties from miscalculation under the settlement agreement 12,000,000  
Additional amount alleged that royalty payments would have increased had Cortez Pipeline Company further reduced its debt 500,000  
Carbon Dioxide Litigation - Colorado Severance Tax [Abstract]    
Number of notices of deficiency issued to assess additional state severance tax with respect to carbon dioxide produced from the McElmo Dome 3  
Amount of the additional severance tax assessed by Colorado 5,700,000  
Amount of interest due on the additional severance tax assessed by Colorado 1,000,000  
Amount of penalties due on the additional severance tax assessed by Colorado 1,700,000  
Carbon Dioxide Litigation - Montezuma County, Colorado Property Tax [Abstract]    
Additional amount of property tax assessed by Montezuma County, Colorado 2,000,000  
Percentage of the additional property tax assessment that is attributable to Kinder Morgan CO2 interests (in hundredths) 3720.00%  
Commercial Litigation Matters - Union Pacific Railroad Company Easements [Abstract]    
The number of years covered by existing contractual arrangements for rent payable for pipeline easements 10  
Commercial Litigation Matters - Premcor Refining Group Arbitration [Abstract]    
Amount of arbitration award 50,300,000  
Additional alleged losses and damages being sought 11,400,000  
Pipeline Integrity and Releases - Barstow, California [Abstract]    
The amount of the settlement with the Navy for past response actions in regards to MTBE releases at the Barstow, California terminal 500,000  
Pipeline Integrity and Releases - Westridge Terminal, Burnaby, British Columbia [Abstract]    
The approximate number of barrels of crude oil released when a section of the Trans Mountain pipeline near the Westridge Terminal in Burnaby, British Columbia was struck 1,400  
General Litigation Matters [Abstract]    
Amount of total reserve recorded for legal fees, transportation rate cases and other litigation liabilities 268,100,000 169,800,000
Increase (decrease) in the reserve 165,000,000  
Payments on litigation reserved for 63,000,000  
Environmental Matters - City of Los Angeles [Abstract]    
Number of parties that have appealed cleanup goals to the state agency relating to Los Angeles Marine Terminal 2  
Estimated amount of future environmental cleanup costs alleged by plaintiff regarding Los Angeles Marine Terminal 10,000,000  
Past damages alleged by plaintiff for environmental cleanup costs regarding Los Angeles Marine Terminal 2,000,000  
Environmental Matters - Paulsboro, New Jersey Liquids Terminal [Abstract]    
Number of cases consolidated in the environmental remediation action in regards to obligations at a Paulsboro, New Jersey liquids terminal 2  
Monetary award included in tentative natural resource damage settlement 1,100,000  
Environmental Matters - Mission Valley Terminal Lawsuit [Abstract]    
Amount of damages claimed by San Diego, California in Mission Valley Terminal Lawsuit 170,000,000  
Amended claim amount 365,000,000  
Environmental Matters - EPA Section 114 Information Request [Abstract]    
Number of affiliated companies receiving a Clean Air Act Section 114 information request 3  
Environmental Matters - General [Abstract]    
Accrued environmental reserve 73,500,000 74,700,000
Receivable for expected cost recoveries that have been deemed probable 6,500,000 8,600,000
Mine Safety Matters    
Aggregate of proposed assessments received 1,136  
Perth Amboy, New Jersey Tank Release    
Penalty proposed by PHMSA $ 425,000