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Guarantee of Securities of Subsidiaries Guarantee of Securities of Subsidiaries (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Sep. 01, 2016
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Parent Issuer and Guarantor |  |
Total debt - KMI and Subsidiaries | $ 13,750 |
Subsidiary Issuer and Guarantor - KMP |  |
Total debt - KMI and Subsidiaries | 18,885 |
Subsidiary Guarantors |  |
Total debt - KMI and Subsidiaries | 3,310 |
Capitalized Lease Debt Not Subject to Cross Guarantee Agreement | $ 162 |
Sale Equity Interest in SNG [Member] |  |
Disposal Group, Equity Interest Sold |  | 50.00%
Southern Natural Gas Company LLC | Sale Equity Interest in SNG [Member] |  |
Disposal Group, Equity Interest Sold |  | 50.00%

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