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Debt Hiland Debt Acquired (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Feb. 13, 2015
Dec. 31, 2014
Debt Instrument [Line Items]        
Repayments of Debt $ 6,305us-gaap_RepaymentsOfDebt $ 4,184us-gaap_RepaymentsOfDebt    
Hiland Partners Holdings LLC [Member] | KMI Senior Notes, 5.50% and 7.25%, due 2020 and 2022 [Member]        
Debt Instrument [Line Items]        
Senior Notes 975us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= kmi_KMISeniorNotes5.50and7.25due2020and2022Member
/ dei_LegalEntityAxis
= kmi_HilandPartnersHoldingLLCMember		   975us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= kmi_KMISeniorNotes5.50and7.25due2020and2022Member
/ dei_LegalEntityAxis
= kmi_HilandPartnersHoldingLLCMember		 0us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= kmi_KMISeniorNotes5.50and7.25due2020and2022Member
/ dei_LegalEntityAxis
= kmi_HilandPartnersHoldingLLCMember
KMI Acquisition of Hiland Partners Holding LLC [Member] | Hiland Partners Holdings LLC [Member] | KMI Senior Notes, 5.50% and 7.25%, due 2020 and 2022 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Fair Value Disclosure     1,043us-gaap_DebtInstrumentFairValue
/ us-gaap_BusinessAcquisitionAxis
= kmi_KMIAcquisitionofHilandPartnersHoldingLLCMember
/ us-gaap_DebtInstrumentAxis
= kmi_KMISeniorNotes5.50and7.25due2020and2022Member
/ dei_LegalEntityAxis
= kmi_HilandPartnersHoldingLLCMember		  
Hiland Partners, LP [Member]        
Debt Instrument [Line Items]        
Repayments of Debt     $ 368us-gaap_RepaymentsOfDebt
/ us-gaap_BusinessAcquisitionAxis
= kmi_HilandPartnersLPMember