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Share-based Compensation and Employee Benefits - Summary of Activity and Related Balances of Restricted Stock Awards (Details) - Restricted Stock Awards - Class P - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares
Outstanding at end of period (shares)	13,000
Kinder Morgan Inc 2015 Amended and Restated Stock Incentive Plan
Shares
Outstanding at beginning of period (shares)	12,414
Granted (shares)	4,532
Vested (shares)	(4,035)
Forfeited (shares)	(229)
Outstanding at end of period (shares)	12,682	12,414
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (dollars per share)	$ 20.07
Granted (dollars per share)	15.10	$ 20.46	$ 17.73
Vested (dollars per share)	21.71
Forfeited (dollars per share)	18.99
Outstanding at end of period (dollars per share)	$ 17.79	$ 20.07

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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