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Share-based Compensation and Employee Benefits - Summary of Future Vesting of Outstanding Restricted Stock Awards (Details) - Restricted Stock Awards - Class P - shares shares in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards outstanding | 13,000 |
Kinder Morgan Inc 2015 Amended and Restated Stock Incentive Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards outstanding | 12,682 | 12,414
Kinder Morgan Inc 2015 Amended and Restated Stock Incentive Plan | 2021 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards outstanding | 4,216 |
Kinder Morgan Inc 2015 Amended and Restated Stock Incentive Plan | 2022 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards outstanding | 3,051 |
Kinder Morgan Inc 2015 Amended and Restated Stock Incentive Plan | 2023 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards outstanding | 4,775 |
Kinder Morgan Inc 2015 Amended and Restated Stock Incentive Plan | 2024 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards outstanding | 127 |
Kinder Morgan Inc 2015 Amended and Restated Stock Incentive Plan | 2025 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards outstanding | 513 |

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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