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General Basis of Presentation (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Loss on impairments of long-lived assets and equity investments $ 77us-gaap_AssetImpairmentCharges $ 0us-gaap_AssetImpairmentCharges
Natural Gas Pipelines [Member]    
Segment Reporting Information [Line Items]    
Loss on impairments of long-lived assets and equity investments 77us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= kmi_NaturalGasPipelinesMember		  
Loss on impairments of long-lived assets $ 51kmi_Lossonimpairmentsoflonglivedassets
/ us-gaap_StatementBusinessSegmentsAxis
= kmi_NaturalGasPipelinesMember