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