v2.4.0.6
Debt Credit Facilities (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
LinesofCredit
Dec. 31, 2012
KMI [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Current Borrowing Capacity $ 1,750  
Line of Credit Facility, Amount Current Borrowing Capacity is Reduced 1,351  
Line of Credit Facility, Amount Outstanding 1,274 1,035
Number of lines of credit outstanding 15  
KMI [Member] | Secured credit facility [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Outstanding 1,274  
KMI [Member] | Credit facility [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Outstanding 77  
Kinder Morgan Energy Partners, L.P. [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Current Borrowing Capacity 2,200  
Line of Credit Facility, Amount Current Borrowing Capacity is Reduced 805  
Number of letters of credit 3  
Remaining borrowing capacity 1,395  
Kinder Morgan Energy Partners, L.P. [Member] | Commercial Paper [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Current Borrowing Capacity is Reduced 595  
Kinder Morgan Energy Partners, L.P. [Member] | Letters of credit [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Current Borrowing Capacity is Reduced 210  
Kinder Morgan Energy Partners, L.P. [Member] | Amended and Retated Credit Agreement [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Current Borrowing Capacity 2,700  
El Paso Pipeline Partners Operating Company, L.L.C. [Member] | Revolving Credit Facility [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Current Borrowing Capacity 1,000  
El Paso Pipeline Partners Operating Company, L.L.C. [Member] | Letters of credit [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Current Borrowing Capacity is Reduced 10  
Supports certain proceedings with the California Public Utilities Commission [Member] | Kinder Morgan Energy Partners, L.P. [Member] | Letters of credit [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Current Borrowing Capacity is Reduced 100  
Support tax-exempt bonds [Member] | Kinder Morgan Energy Partners, L.P. [Member] | Letters of credit [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Current Borrowing Capacity is Reduced 85  
Supporting other obligations of KMP and its subsidiaries [Member] | Kinder Morgan Energy Partners, L.P. [Member] | Letters of credit [Member]
    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Amount Current Borrowing Capacity is Reduced $ 25