Share-based Compensation and Employee Benefits - Summary of Future Vesting of Outstanding Restricted Stock Awards (Details) - Restricted Stock Awards - Class P - shares	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding	12,000,000
Kinder Morgan Inc 2015 Amended and Restated Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding	12,413,556	13,154,605	10,518,344	9,038,137
Kinder Morgan Inc 2015 Amended and Restated Stock Incentive Plan | 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding	3,271,081
Kinder Morgan Inc 2015 Amended and Restated Stock Incentive Plan | 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding	4,628,872
Kinder Morgan Inc 2015 Amended and Restated Stock Incentive Plan | 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding	3,356,768
Kinder Morgan Inc 2015 Amended and Restated Stock Incentive Plan | 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding	549,164
Kinder Morgan Inc 2015 Amended and Restated Stock Incentive Plan | 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding	127,173
Kinder Morgan Inc 2015 Amended and Restated Stock Incentive Plan | Thereafter
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding	480,498