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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Other comprehensive income (loss) tax (benefit) expense attributable to Kinder Morgan, Inc.    
Change in fair value of derivatives utilized for hedging purposes, tax benefit attributable to KMI $ 6 $ 22
Reclassification of change in fair value of derivatives to net income, tax expense attributable to KMI 1 (6)
Foreign currency translation adjustments, tax expense attributable to KMI 7 (7)
Adjustments to pension and other postretirement benefit liabilities, tax benefit attributable to KMI 0 0
Other comprehensive income loss tax portion attributable to noncontrolling interests    
Change in fair value of derivatives utilized for hedging purposes, tax benefit attributable to noncontrolling interests 3 5
Reclassification of change in fair value of derivatives to net income, tax expense attributable to noncontrolling interests 0 (1)
Foreign currency translation adjustments, tax expense attributable to noncontrolling interests 2 (2)
Adjustments to pension and other postretirement benefit liabilities, tax benefit attributable to noncontrolling interests 0 0
Other comprehensive income loss tax portion total    
Change in fair value of derivatives utilized for hedging purposes, tax benefit total 9 27
Reclassification of change in fair value of derivatives to net income, tax expense total 1 (7)
Foreign currency translation adjustments, tax expense total 9 (9)
Adjustments to pension and other postretirement benefit plan liabilities, tax benefit total $ 0 $ 0