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Summary of Significant Accounting Policies Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Regulatory Assets and Liabilities [Text Block] | The following table summarizes our regulatory asset and liability balances as of December 31, 2017 and 2016 (in millions):
| December 31,
| 2017 |  | 2016
Current regulatory assets | $ | 60 |  |  | $ | 49 |
Non-current regulatory assets | 288 |  |  | 330 |
Total regulatory assets(a) | $ | 348 |  |  | $ | 379 |
Current regulatory liabilities | $ | 107 |  |  | $ | 101 |
Non-current regulatory liabilities | 236 |  |  | 108 |
Total regulatory liabilities(b) | $ | 343 |  |  | $ | 209 |
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(a) | Regulatory assets as of December 31, 2017 include (i) $193 million of unamortized losses on disposal of assets; (ii) $55 million income tax gross up on equity AFUDC; and (iii) $100 million of other assets including amounts related to fuel tracker arrangements. Approximately $124 million of the regulatory assets, with a weighted average remaining recovery period of 17 years, are recoverable without earning a return, including the income tax gross up on equity AFUDC for which there is an offsetting deferred income tax balance for FERC rate base purposes, and therefore, it does not earn a return.
(b) | Regulatory liabilities as of December 31, 2017 are comprised of customer prepayments to be credited to shippers or other over-collections that are expected to be returned to shippers or netted against under-collections over time. Approximately $20 million of the $236 million classified as non-current is expected to be credited to shippers over a remaining weighted average period of 28 years, while the remaining $216 million is not subject to a defined period.
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following tables set forth the allocation of net income available to shareholders of Class P shares and participating securities and the reconciliation of Basic Weighted Average Common Shares Outstanding to Diluted Weighted Average Common Shares Outstanding (in millions):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Net Income Available to Common Stockholders | $ | 27 |  |  | $ | 552 |  |  | $ | 227 |
Participating securities: |  |  |  |  |
Less: Net Income Allocated to Restricted stock awards(a) | (5 | ) |  | (4 | ) |  | (13 | )
Net Income Allocated to Class P Stockholders | $ | 22 |  |  | $ | 548 |  |  | $ | 214 |
Basic Weighted Average Common Shares Outstanding | 2,230 |  |  | 2,230 |  |  | 2,187 |
Basic Earnings Per Common Share | $ | 0.01 |  |  | $ | 0.25 |  |  | $ | 0.10 |
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Basic Weighted Average Common Shares Outstanding | 2,230 |  |  | 2,230 |  |  | 2,187 |
Effect of dilutive securities: |  |  |  |  |
Warrants | — |  |  | — |  |  | 6 |
Diluted Weighted Average Common Shares Outstanding | 2,230 |  |  | 2,230 |  |  | 2,193 |
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(a) | As of December 31, 2017, there were approximately 11 million such restricted stock awards.
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] | The following maximum number of potential common stock equivalents are antidilutive and, accordingly, are excluded from the determination of diluted earnings per share (in millions on a weighted average basis):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Unvested restricted stock awards | 10 |  |  | 8 |  |  | 7 |
Warrants to purchase our Class P shares(a) | 116 |  |  | 293 |  |  | 291 |
Convertible trust preferred securities | 3 |  |  | 8 |  |  | 8 |
Mandatory convertible preferred stock(b) | 58 |  |  | 58 |  |  | 10 |
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(a) | On May 25, 2017, approximately 293 million of unexercised warrants expired without the issuance of Class P common stock. Prior to expiration, each warrant entitled the holder to purchase one share of our common stock for an exercise price of $40 per share. The potential dilutive effect of the warrants did not consider the assumed proceeds to KMI upon exercise.
(b) | Until our mandatory convertible preferred shares are converted to common shares, on or before the expected mandatory conversion date of October 26, 2018, the holder of each preferred share participates in our earnings by receiving preferred stock dividends.

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The entire disclosure for detailed information about regulatory assets and liabilities, including current and noncurrent assets created when regulatory agencies permit the deferral of costs to the balance sheet that would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues, as well as current and noncurrent liabilities created when regulatory agencies permit. + References No definition available. + Details
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