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Stockholders' Equity Noncontrolling Interests (Details) CAD / shares in Units, $ / shares in Units, CAD in Millions, $ in Millions |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 17, 2018 CAD / shares | Dec. 08, 2017 USD ($) shares | Dec. 08, 2017 CAD CAD / shares shares | Aug. 15, 2017 USD ($) shares | Aug. 15, 2017 CAD CAD / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2017 CAD CAD / shares shares | May 30, 2017 shares | Dec. 31, 2016 shares
Preferred Stock, Shares Issued | shares |  |  |  |  |  | 1,600,000 | 1,600,000 |  | 1,600,000
Kinder Morgan Canada Limited [Member] |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  | 30.00% |
Per restricted voting share declared for the period(b) |  |  |  |  |  |  | CAD 0.3821 |  |
Per restricted voting share paid in the period | (per share) |  |  |  |  |  | $ 0.1739 | CAD 0.2196 |  |
Cash distributions paid in the period to the public |  |  |  |  |  | $ 13 | CAD 16 |  |
Share distributions paid in the period to the public under KML’s DRIP | shares |  |  |  |  |  | 418,989 | 418,989 |  |
Restricted Voting Shares in Public Offering [Member] | Kinder Morgan Canada Limited [Member] |  |  |  |  |  |  |  |  |
Shares, Issued | shares |  |  |  |  |  |  |  | 102,942,000 |
Restricted Voting Shares [Member] | Kinder Morgan Canada Limited [Member] |  |  |  |  |  |  |  |  |
Total value of distributions paid in the period |  |  |  |  |  | $ 18 | CAD 23 |  |
Cumulative Redeemable Minimum Rate Reset Preferred Shares, Series 1 [Member] | Kinder Morgan Canada Limited [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued | shares |  |  |  | 12,000,000 | 12,000,000 |  |  |  |
Preferred Stock, Series 1 Offering Price, Per Share |  |  |  |  | CAD 25.00 |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  |  |  | $ 235 | CAD 300 |  |  |  |
Net Proceeds from issuance of Preferred Stock |  |  |  |  |  | $ 230 | CAD 293 |  |
Preferred Shares, Annualized Dividend Per Share |  |  |  |  |  |  | CAD 1.3125 |  |
Per Series 1 Preferred Share paid in the period | (per share) |  |  |  |  |  | $ 0.2624 | CAD 0.3308 |  |
Cash distributions paid in the period to the public |  |  |  |  |  | $ 3 | CAD 4 |  |
Cumulative Redeemable Minimum Rate Reset Preferred Shares, Series 3 [Member] | Kinder Morgan Canada Limited [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued | shares |  | 10,000,000 | 10,000,000 |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock |  | $ 195 | CAD 250 |  |  |  |  |  |
Preferred Stock, Series 3 Offering Price, Per Share |  |  | CAD 25.00 |  |  |  |  |  |
Net Proceeds from issuance of Preferred Stock |  |  |  |  |  | $ 189 | CAD 243 |  |
Preferred Shares, Annualized Dividend Per Share |  |  |  |  |  |  | CAD 1.3000 |  |
Minimum [Member] | Kinder Morgan Canada Limited [Member] |  |  |  |  |  |  |  |  |
Market Discount for the Dividend Paid on Restricted Voting Shares |  |  |  |  |  | 0.00% | 0.00% |  |
Maximum [Member] | Kinder Morgan Canada Limited [Member] |  |  |  |  |  |  |  |  |
Market Discount for the Dividend Paid on Restricted Voting Shares |  |  |  |  |  | 5.00% | 5.00% |  |
Subsequent Event [Member] | Cumulative Redeemable Minimum Rate Reset Preferred Shares, Series 1 [Member] | Kinder Morgan Canada Limited [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared | CAD 0.328125 |  |  |  |  |  |  |  |
Subsequent Event [Member] | Cumulative Redeemable Minimum Rate Reset Preferred Shares, Series 3 [Member] | Kinder Morgan Canada Limited [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Dividends Per Share, Declared | CAD 0.22082 |  |  |  |  |  |  |  |

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