General (Notes)	12 Months Ended
General (Notes)	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	General The Company was incorporated under the Business Corporations Act (Alberta) on April 7, 2017. On May 30, 2017, we completed an IPO of our Restricted Voting Shares and used the net proceeds of $1,671.0 million to acquire an approximate 30% indirect equity interest in the Limited Partnership from certain affiliates of Kinder Morgan, who retained an approximate 70% equity ownership of the limited partnership units in the Limited Partnership. When we refer to “us,” “we,” “our,” “ours,” “the Company,” or “KML,” we are describing Kinder Morgan Canada Limited. The Limited Partnership and Kinder Morgan Canada GP Inc. (the “General Partner”), were formed under the laws of the Province of Alberta in conjunction with the IPO. After the sale of the Trans Mountain Asset Group further discussed in Note 3 , the Limited Partnership, through its ownership of KMCU, indirectly consolidates KMCSI and all or its proportion of the following operating entities (collectively the “Operating Entities”): •KMCU •KM Canada Marine Terminal Limited Partnership •KM Canada North 40 Limited Partnership •KM Canada Rail Holdings GP Limited •KM Canada (Jet Fuel) Inc. •KM Canada Terminals GP ULC •KM Canada Edmonton South Rail Terminal Limited Partnership^(a) •KM Canada Edmonton North Rail Terminal Limited Partnership^(a) •Base Line Terminal East Limited Partnership^(a) _______ a.Through these wholly owned partnerships we own a 50% undivided interest in joint venture operations with unaffiliated entities that are proportionality consolidated. The Limited Partnership is a variable interest entity because a simple majority or lower threshold of the limited partnership interests do not possess substantive “kick-out” rights (i.e., the right to remove the general partner or to dissolve (liquidate) the entity without cause) or substantive participation rights. The General Partner is the primary beneficiary because it has the power to direct the activities that most significantly impact the Limited Partnership’s performance and the right to receive benefits, and obligation to absorb losses, that could be significant to the Limited Partnership. As a result, the General Partner consolidates the Limited Partnership. The General Partner is a wholly owned subsidiary of the Company. Consequently, we indirectly consolidate the Limited Partnership and the Operating Entities in our consolidated financial statements. Business Description We have two business segments: (i) the Terminals segment which includes the ownership and operation of liquid product merchant storage and rail terminals in the Edmonton, Alberta market as well as a predominantly dry cargo import/export facility in Vancouver, B.C. and (ii) the Pipelines segment which owns and operates Cochin and Jet Fuel. Our Reorganization and IPO On May 30, 2017, we completed an IPO of 102,942,000 Restricted Voting Shares (number of shares is before our January 4, 2019 Share Consolidation, see Note 3) on the TSX at a price of $17.00 per Restricted Voting Share for total gross proceeds of approximately $1.75 billion. We used our IPO proceeds to indirectly acquire from Kinder Morgan an approximate 30% equity interest in the Limited Partnership, with Kinder Morgan retaining the remaining approximate 70% equity interest. Concurrent with closing of our IPO, the Limited Partnership acquired an interest in the Operating Entities from KMCC and KMTU, each wholly owned subsidiaries of Kinder Morgan, in exchange for the issuance to KMCC and KMCT of Class B Units of the Limited Partnership. In addition, KMCC and KMCT were issued Special Voting Shares in the Company for nominal consideration. Immediately following the closing of our IPO, we used the proceeds from our IPO to indirectly subscribe for Class A Units representing an approximate 30% economic interest in the Limited Partnership while the Class B Units held by KMCC and KMCT represent, in the aggregate, an approximate 70% economic interest in the Limited Partnership. Following the issuance of the Series 1 Preferred Shares and Series 3 Preferred Shares, the Company’s and Kinder Morgan’s respective interests in the Limited Partnership are subject to the preferred shareholders’ priority on distributions and upon liquidation. After the completion of our IPO and the reorganization transaction described above and as of December 31, 2017, the issued and outstanding Restricted Voting Shares comprises approximately 30% of the votes attached to all outstanding Company voting shares, and the Kinder Morgan interest, which represents its indirect ownership of 100% of the Special Voting Shares, comprises approximately 70% of the votes attached to all outstanding Company voting shares. Subsequent to our IPO, Kinder Morgan retained control of us and the Limited Partnership, and as a result we accounted for our acquisition of an approximate 30% equity interest in the Limited Partnership as a transfer of net assets among entities under common control. Therefore, our consolidated financial statements presented herein were derived from the consolidated financial statements and accounting records of Kinder Morgan. The assets and liabilities in these consolidated financial statements have been reflected at historical carrying value of the immediate parents within the Kinder Morgan organizational structure including goodwill and purchase price assigned amounts, as applicable. Prior to May 30, 2017, our historical financial statements were presented as combined consolidated financial statements derived from information included within the consolidated financial statements and accounting records of Kinder Morgan. All significant intercompany balances between the companies included in our accompanying consolidated financial statements have been eliminated. In addition, as of and for the reporting periods after May 30, 2017, Kinder Morgan’s economic interest in the Limited Partnership is reflected within “Kinder Morgan interest” in our consolidated statements of equity and consolidated balance sheets and earnings attributable to Kinder Morgan’s economic ownership interest in the Limited Partnership is presented in “Net Income Attributable to Kinder Morgan Interest” in our consolidated statements of income. Kinder Morgan retained control of us, therefore, the amounts recorded to “Restricted Voting Share capital,” “Retained deficit,” “Accumulated other comprehensive loss” and “Kinder Morgan interest” presented in the consolidated statement of equity for the year ended December 31, 2017 include (i) the “Issuance of special voting shares and reallocation of Kinder Morgan pre-IPO carrying basis” which represents Kinder Morgan’s pre-IPO 100% ownership interest in us including net income for the period January 1 through May 29, 2017 and (ii) the “Reallocation of equity on common control transaction” which represents the difference between our book value prior to our IPO and the proportionate ownership percentages in the book value in our net assets after our IPO.