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Share-based Compensation and Employee Benefits (Summary of Future Vesting of Outstanding Restricted Stock Awards) (Details) - Kinder Morgan Inc 2015 Amended and Restated Stock Incentive Plan [Member] - Restricted Stock [Member] - Class P - shares | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards outstanding | 13,154,605 | 10,518,344 | 9,038,137 | 7,645,105
2019 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards outstanding | 4,048,963 |  |  |
2020 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards outstanding | 3,537,544 |  |  |
2021 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards outstanding | 4,814,403 |  |  |
2022 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards outstanding | 152,104 |  |  |
2023 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards outstanding | 121,093 |  |  |
Thereafter [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Awards outstanding | 480,498 |  |  |

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