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Stockholders' Equity Noncontrolling Interests (Details) $ / shares in Units, $ in Millions, $ in Millions								12 Months Ended
	Jan. 03, 2019 USD ($)	Jan. 03, 2019 CAD ($)	Dec. 08, 2017 USD ($) shares	Dec. 08, 2017 CAD ($) $ / shares shares	Aug. 15, 2017 USD ($) shares	Aug. 15, 2017 CAD ($) $ / shares shares	May 30, 2017 shares	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2017 CAD ($) shares	Dec. 31, 2016 USD ($)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest								$ 853	$ 853	$ 1,488
Dividends, Preferred Stock, Cash									128	156		$ 156
Kinder Morgan Canada Limited [Member]
Cash distributions paid in the period to the public									38	13
Value of Restricted Shares Issued in Lieu of Cash Dividends									$ 14	$ 5
Share distributions paid in the period to the public under KML’s DRIP | shares									1,092,791	418,989	418,989
Restricted Voting Shares in Public Offering [Member] | Kinder Morgan Canada Limited [Member]
Share issued (in shares) | shares							102,942,000
Restricted Voting Shares [Member] | Kinder Morgan Canada Limited [Member]
Total value of distributions paid in the period									$ 52	$ 18
Cumulative Redeemable Minimum Rate Reset Preferred Shares, Series 1 and 3 [Member] [Domain] | Kinder Morgan Canada Limited [Member]
Dividends, Preferred Stock, Cash									$ 21
Cumulative Redeemable Minimum Rate Reset Preferred Shares, Series 1 [Member] | Kinder Morgan Canada Limited [Member]
Share issued (in shares) | shares					12,000,000	12,000,000
Preferred Stock, Series 1 Offering Price, Per Share | $ / shares						$ 25.00
Proceeds from Issuance of Preferred Stock and Preference Stock					$ 235	$ 300
Net Proceeds from issuance of Preferred Stock										230	$ 293
Preferred Shares, Annualized Dividend Per Share | $ / shares								$ 1.3125
Dividends, Preferred Stock, Cash										3
Cumulative Redeemable Minimum Rate Reset Preferred Shares, Series 3 [Member] | Kinder Morgan Canada Limited [Member]
Share issued (in shares) | shares			10,000,000	10,000,000
Proceeds from Issuance of Preferred Stock and Preference Stock			$ 195	$ 250
Preferred Stock, Series 3 Offering Price, Per Share | $ / shares				$ 25.00
Net Proceeds from issuance of Preferred Stock										189	$ 243
Preferred Shares, Annualized Dividend Per Share | $ / shares								$ 1.3000
Minimum [Member] | Kinder Morgan Canada Limited [Member]
Market Discount for the Dividend Paid on Restricted Voting Shares									0.00%
Maximum [Member] | Kinder Morgan Canada Limited [Member]
Market Discount for the Dividend Paid on Restricted Voting Shares									5.00%
Subsequent Event
Payments to Noncontrolling Interests	$ 900	$ 1,200
Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest								$ 853	$ 853	1,488
Kinder Morgan Canada Limited [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners							30.00%
Kinder Morgan Canada Limited Partnership [Member] | Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest								514	514	1,163
Others [Member] [Member] | Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest								$ 339	$ 339	$ 325

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