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Share-based Compensation and Employee Benefits (Share-based Compensation - Narrative) (Details) - Restricted Stock [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Kinder Morgan, Inc. Amended and Restated Stock Compensation Plan for Nonemployee Directors[Member] | Class P |  |  |
Share-based Compensation [Abstract] |  |  |
Shares of Class P common stock authorized under the plan | 250,000 |  |
Kinder Morgan, Inc. Amended and Restated Stock Compensation Plan for Nonemployee Directors[Member] | Class P | Six Month Vesting Period [Member] |  |  |
Share-based Compensation [Abstract] |  |  |
Grants during the period (shares) | 25,800 | 17,740 | 31,880
Value of shares granted | $ 0.5 | $ 0.4 | $ 0.4
Award vesting period | 6 months |  |
Kinder Morgan Inc 2015 Amended and Restated Stock Incentive Plan [Member] | Class P |  |  |
Share-based Compensation [Abstract] |  |  |
Shares of Class P common stock authorized under the plan | 33,000,000 |  |
Grants during the period (shares) | 5,389,476 | 3,221,691 | 2,816,599
Intrinsic value of restricted stock vested | $ 42.0 | $ 30.0 | $ 25.0
Expense related to restricted stock awards | 63.0 | 65.0 | 66.0
Amounts capitalized related to restricted stock awards | 13.0 | 9.0 | $ 9.0
Unrecognized compensation costs | $ 127.0 | $ 127.0 |
Unrecognized compensation costs, weighted average remaining amortization period | 2 years 3 months 26 days | 2 years 3 months 26 days |
Kinder Morgan Inc 2015 Amended and Restated Stock Incentive Plan [Member] | Class P | Minimum [Member] |  |  |
Share-based Compensation [Abstract] |  |  |
Award vesting period | 1 year |  |
Kinder Morgan Inc 2015 Amended and Restated Stock Incentive Plan [Member] | Class P | Maximum [Member] |  |  |
Share-based Compensation [Abstract] |  |  |
Award vesting period | 10 years |  |
KML Restricted Share Unit Plan for Employees [Member] |  |  |
Share-based Compensation [Abstract] |  |  |
Expense related to restricted stock awards | $ 6.0 | $ 1.0 |
Amounts capitalized related to restricted stock awards | 2.0 | $ 1.0 |
Unrecognized compensation costs | $ 3.0 |  |
Unrecognized compensation costs, weighted average remaining amortization period | 2 years 1 month 6 days |  |

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- Definition Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + 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 (h)(1)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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