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Related Party Transactions Notes Receivable (Details)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2012
Plantation Pipe Line Company [Member]
USD ($)
Dec. 31, 2011
Plantation Pipe Line Company [Member]
USD ($)
Dec. 31, 2012
Express US Holdings LP [Member]
CAD
Dec. 31, 2012
Kinder Morgan, Inc. [Member]
USD ($)
Dec. 31, 2012
Express Pipeline System [Member]
USD ($)
Dec. 31, 2011
Express Pipeline System [Member]
USD ($)
Related Party Transaction [Line Items]                
Equity Method Investment, Ownership Percentage     51.17%          
Initial Balance Of Debt Security Portion Of Which Acquired In Investment         114      
Notes Receivable, Related Parties     49 50     114 112
Related Party Transaction, Rate     4.25%   12.00%      
Notes Receivable, Balloon Payment, Related Parties     45          
Notes Receivable, Related Parties, Current     1          
Due from Related Parties 14 26            
Repayment of Notes Receivable from Related Parties           44    
Related party note receivable that was forgiven and treated as a reduction in capital $ 466