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Consolidated Statements of Changes in Equity (Parenthetical) - CAD / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Cash dividends declared on common stock | CAD 1.995 | CAD 1.6625
Series A Preferred Stock [Member] |  |
Cash dividends declared on preferred stock | 0.6388 |
Series B Preferred Stock [Member] |  |
Cash dividends declared on preferred stock | 0.5724 |
Series E Preferred Stock [Member] |  |
Cash dividends declared on preferred stock | CAD 1.125 |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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