v2.4.0.6
Debt Kinder Morgan G.P., Inc. Preferred Shares (Details) (Kinder Morgan G.P., Inc. [Member], USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Kinder Morgan G.P., Inc. [Member]
   
Debt Instrument [Line Items]    
Preferred Stock, Dividend Rate, Per-Dollar-Amount $ 10.469 $ 10.638