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Risk Management Risk Management Foreign Currency Risk Management (Details)
 3 Months Ended
Mar. 31, 2015
KMI 1.50% Senior Notes Due 2022 [Member] | Currency Swap [Member]  
Derivative [Line Items]  
Debt Instrument, Interest Rate, Stated Percentage 3.79%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kmi_KMI1.50SeniorNotesDue2022Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember
KMI 2.25% Senior Notes Due 2027 [Member] | Currency Swap [Member]  
Derivative [Line Items]  
Debt Instrument, Interest Rate, Stated Percentage 4.67%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kmi_KMI2.25SeniorNotesDue2027Member
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember
Kinder Morgan, Inc. [Member]  
Derivative [Line Items]  
Debt Instrument, Term 5 years
Kinder Morgan, Inc. [Member] | KMI 1.50% Senior Notes Due 2022 [Member]  
Derivative [Line Items]  
Debt Instrument, Interest Rate, Stated Percentage 1.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kmi_KMI1.50SeniorNotesDue2022Member
/ dei_LegalEntityAxis
= kmi_KinderMorganIncMember
Debt Instrument, Term 7 years
Kinder Morgan, Inc. [Member] | KMI 2.25% Senior Notes Due 2027 [Member]  
Derivative [Line Items]  
Debt Instrument, Interest Rate, Stated Percentage 2.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kmi_KMI2.25SeniorNotesDue2027Member
/ dei_LegalEntityAxis
= kmi_KinderMorganIncMember
Debt Instrument, Term 12 years