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Risk Management Foreign Currency Risk Management (Details) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017
Derivative [Line Items] |  |  |
Cross-currency Swap Agreements | $ 1,358 |  |
KMI 1.50% Senior Notes Due 2022 [Member] |  |  |
Derivative [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.50% | 1.50% | 1.50%
Debt Instrument, Term | 7 years |  |
KMI 2.25% Senior Notes Due 2027 [Member] |  |  |
Derivative [Line Items] |  |  |
Debt Instrument, Term | 12 years |  |
Currency Swap [Member] | KMI 1.50% Senior Notes Due 2022 [Member] |  |  |
Derivative [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.79% | 3.79% |
Currency Swap [Member] | KMI 2.25% Senior Notes Due 2027 [Member] |  |  |
Derivative [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.67% | 4.67% |
Net Investment Hedging [Member] | Currency Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 1,888 | $ 2,450 |

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