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Stockholders Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity Note [Abstract] |
Schedule of Dividends Payable [Table Text Block] | The following table provides information about our per share dividends:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Per common share cash dividend declared for the period | $ | 0.50 |  |  | $ | 0.50 |  |  | $ | 1.605 |
Per common share cash dividend paid in the period | 0.50 |  |  | 0.50 |  |  | 1.93 |
Schedule of Preferred Stock Dividends [Table Text Block] | The following table provides information regarding our preferred stock dividends:
Period |  | Total dividend per share for the period |  | Date of declaration |  | Date of record |  | Date of dividend
January 26, 2017 through April 25, 2017 |  | $24.375 |  | January 18, 2017 |  | April 11, 2017 |  | April 26, 2017
April 26, 2017 through July 25, 2017 |  | 24.375 |  | April 19, 2017 |  | July 11, 2017 |  | July 26, 2017
July 26, 2017 through October 25, 2017 |  | 24.375 |  | July 19, 2017 |  | October 11, 2017 |  | October 26, 2017
October 26, 2017 through January 25, 2018 |  | 24.375 |  | October 18, 2017 |  | January 11, 2018 |  | January 26, 2018
Schedule of Distributions by Noncontrolling Interests [Table Text Block] | The following table provides information regarding distributions to our noncontrolling interests (in millions except per share and share distribution amounts):
|  | Year Ended December 31, 2017
|  | Shares |  | U.S.$ |  | C$
KML Restricted Voting Shares(a) |  |  |  |  |  |
Per restricted voting share declared for the period(b) |  |  |  |  |  | $0.3821
Per restricted voting share paid in the period |  |  |  | $0.1739 |  | 0.2196
Total value of distributions paid in the period |  |  |  | 18 |  | 23
Cash distributions paid in the period to the public |  |  |  | 13 |  | 16
Share distributions paid in the period to the public under KML’s DRIP |  | 418,989 |  |  |  |
KML Series 1 Preferred Shares(c) |  |  |  |  |  |
Per Series 1 Preferred Share paid in the period |  |  |  | $0.2624 |  | $0.3308
Cash distributions paid in the period to the public |  |  |  | 3 |  | 4
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(a) | Represents dividends subsequent to KML’s May 30, 2017 IPO.
(b) | The U.S.$ equivalent of the dividends declared is calculated based on the exchange rate on the dividend payment date, therefore, the U.S.$ equivalent of the dividend declared for the fourth quarter of 2017 will be calculated using the exchange rate on February 15, 2018.
The combined U.S.$ equivalent of the dividends declared for the second and third quarters of 2017 was $0.1739.
(c) | Represents dividends subsequent to the issuance of KML’s Series 1 Preferred Shares.

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