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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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