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Additional cash flow information (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Changes in liabilities arising from financing activities [abstract] |  |
January 1, 2017 | $ 22,045 |
Cash flows used in financing activities |  |
Increase in notes payable | 333 | $ 991
Issue of long-term debt | 3,011 | 2,244
Repayment of long-term debt | (2,653) | (2,516)
Cash dividends paid on common and preferred shares | (2,639) |
Cash dividends paid by subsidiaries to non-controlling interests | (34) | (46)
Other financing activities | (60) | (54)
Increase (decrease) in liabilities arising from financing activities | (2,042) |
Non-cash changes arising from |  |
Finance lease additions | 339 |
Dividends declared on common and preferred shares | 2,692 |
Dividends declared by subsidiaries to non-controlling interests | 45 |
Effect of changes in foreign exchange rates | 0 |
Business acquisitions | 972 |
Other | 74 |
Total non-cash changes | 4,122 |
December 31, 2017 | 24,125 | 22,045
DEBT DUE WITHIN ONE YEAR AND LONG-TERM DEBT |  |
Changes in liabilities arising from financing activities [abstract] |  |
January 1, 2017 | 21,459 |
Cash flows used in financing activities |  |
Increase in notes payable | 452 |
Issue of long-term debt | 3,011 |
Repayment of long-term debt | (2,653) |
Cash dividends paid on common and preferred shares | 0 |
Cash dividends paid by subsidiaries to non-controlling interests | 0 |
Other financing activities | (44) |
Increase (decrease) in liabilities arising from financing activities | 766 |
Non-cash changes arising from |  |
Finance lease additions | 339 |
Dividends declared on common and preferred shares | 0 |
Dividends declared by subsidiaries to non-controlling interests | 0 |
Effect of changes in foreign exchange rates | (198) |
Business acquisitions | 972 |
Other | 55 |
Total non-cash changes | 1,168 |
December 31, 2017 | 23,393 | 21,459
DERIVATIVE TO HEDGE FOREIGN CURRENCY ON DEBT |  |
Changes in liabilities arising from financing activities [abstract] |  |
January 1, 2017 | (31) |
Cash flows used in financing activities |  |
Increase in notes payable | (119) |
Issue of long-term debt | 0 |
Repayment of long-term debt | 0 |
Cash dividends paid on common and preferred shares | 0 |
Cash dividends paid by subsidiaries to non-controlling interests | 0 |
Other financing activities | 6 |
Increase (decrease) in liabilities arising from financing activities | (113) |
Non-cash changes arising from |  |
Finance lease additions | 0 |
Dividends declared on common and preferred shares | 0 |
Dividends declared by subsidiaries to non-controlling interests | 0 |
Effect of changes in foreign exchange rates | 198 |
Business acquisitions | 0 |
Other | 0 |
Total non-cash changes | 198 |
December 31, 2017 | 54 | (31)
DIVIDENDS PAYABLE |  |
Changes in liabilities arising from financing activities [abstract] |  |
January 1, 2017 | 617 |
Cash flows used in financing activities |  |
Increase in notes payable | 0 |
Issue of long-term debt | 0 |
Repayment of long-term debt | 0 |
Cash dividends paid on common and preferred shares | (2,639) |
Cash dividends paid by subsidiaries to non-controlling interests | (34) |
Other financing activities | 0 |
Increase (decrease) in liabilities arising from financing activities | (2,673) |
Non-cash changes arising from |  |
Finance lease additions | 0 |
Dividends declared on common and preferred shares | 2,692 |
Dividends declared by subsidiaries to non-controlling interests | 45 |
Effect of changes in foreign exchange rates | 0 |
Business acquisitions | 0 |
Other | (3) |
Total non-cash changes | 2,734 |
December 31, 2017 | 678 | 617
OTHER LIABILITIES |  |
Changes in liabilities arising from financing activities [abstract] |  |
January 1, 2017 | 0 |
Cash flows used in financing activities |  |
Increase in notes payable | 0 |
Issue of long-term debt | 0 |
Repayment of long-term debt | 0 |
Cash dividends paid on common and preferred shares | 0 |
Cash dividends paid by subsidiaries to non-controlling interests | 0 |
Other financing activities | (22) |
Increase (decrease) in liabilities arising from financing activities | (22) |
Non-cash changes arising from |  |
Finance lease additions | 0 |
Dividends declared on common and preferred shares | 0 |
Dividends declared by subsidiaries to non-controlling interests | 0 |
Effect of changes in foreign exchange rates | 0 |
Business acquisitions | 0 |
Other | 22 |
Total non-cash changes | 22 |
December 31, 2017 | $ 0 | $ 0

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