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Supplemental Cash Flow Information - Reconciliation of movements of liabilities to cash flows (Details) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Short-Term Debt |  |
Reconciliation of movements of liabilities to cash flows arising from financing activities |  |
Liabilities arising from financing activities at beginning of period | CAD 1,273 |
Changes from financing cash flows: |  |
Net issuance of commercial paper | 1,065 |
Realized foreign exchange gain | (84) |
Unrealized foreign exchange gain | (118) |
Liabilities arising from financing activities at end of period | 2,136 | CAD 1,273
Current Portion Of Long-Term Debt |  |
Reconciliation of movements of liabilities to cash flows arising from financing activities |  |
Liabilities arising from financing activities at beginning of period | 54 |
Changes from financing cash flows: |  |
Reclassification from long-term debt to current portion of long-term debt | 17 |
Liabilities arising from financing activities at end of period | 71 | 54
Long-Term Debt |  |
Reconciliation of movements of liabilities to cash flows arising from financing activities |  |
Liabilities arising from financing activities at beginning of period | 16,103 |
Changes from financing cash flows: |  |
Gross proceeds from issuance of long-term debt | 955 |
Debt issuance costs |  | (13)
Repayment of long-term debt | (2,561) |
Realized foreign exchange gain | (612) |
Payment of finance lease liabilities | (58) |
Unrealized foreign exchange gain | (653) |
Deferred financing costs | (14) |
New finance lease liabilities | 628 |
Reclassification from long-term debt to current portion of long-term debt | (17) |
Reclassification from a finance lease to a service arrangement | (386) |
Liabilities arising from financing activities at end of period | 13,372 | 16,103
Partnership Liability |  |
Changes from financing cash flows: |  |
Proceeds from sale of non-controlling interest | 503 |
Distributions to non-controlling interest | (20) |
Liabilities arising from financing activities at end of period | 483 |
Dividends Payable |  |
Changes from financing cash flows: |  |
Dividends paid on common shares | (2,124) |
Dividends declared on common shares | 2,124 |
Derivative Liabilities |  |
Reconciliation of movements of liabilities to cash flows arising from financing activities |  |
Liabilities arising from financing activities at beginning of period | 17 |
Changes from financing cash flows: |  |
Net settlement of derivatives | 25 |
Proceeds from settlement of derivatives | (25) |
Liabilities arising from financing activities at end of period |  | CAD 17
Derivative Assets |  |
Changes from financing cash flows: |  |
Unrealized fair value gain recognized in earnings | CAD (42) |

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