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SUPPLEMENTAL CASH FLOW INFORMATION - Reconciliation of movements of liabilities to cash flows (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Short-Term Debt |  |
Reconciliation of movements of liabilities to cash flows arising from financing activities |  |
Liabilities arising from financing activities at beginning of period | $ 2,155 | $ 3,231
Changes from financing cash flows: |  |
Net issuance (repayment) of commercial paper | 1,445 | (982)
Unrealized foreign exchange gains | (34) | (94)
Liabilities arising from financing activities at end of period | 3,566 | 2,155
Current Portion of Long-Term Lease Liabilities |  |
Reconciliation of movements of liabilities to cash flows arising from financing activities |  |
Liabilities arising from financing activities at beginning of period | 310 |
Changes from financing cash flows: |  |
Lease liability payments | (335) | (307)
Reclassification of lease obligations | (297) | 617
Liabilities arising from financing activities at end of period | 272 | 310
Long-Term Lease Liabilities |  |
Reconciliation of movements of liabilities to cash flows arising from financing activities |  |
Liabilities arising from financing activities at beginning of period | 2,621 |
Changes from financing cash flows: |  |
Reclassification of debt |  | 1,260
Reclassification of lease obligations | 297 | (617)
New leases | 312 | 1,978
Liabilities arising from financing activities at end of period | 2,636 | 2,621
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 |  | 229
Changes from financing cash flows: |  |
Repayment of long-term debt |  | (188)
Realized foreign exchange losses |  | 7
Unrealized foreign exchange gains | (20) | (10)
Reclassification of debt | (1,433) | (38)
Liabilities arising from financing activities at end of period | 1,413 |
Long-Term Debt |  |
Reconciliation of movements of liabilities to cash flows arising from financing activities |  |
Liabilities arising from financing activities at beginning of period | 12,884 | 13,890
Changes from financing cash flows: |  |
Gross proceeds from issuance of long-term debt | 2,651 | 750
Debt issuance costs | (17) | (5)
Unrealized foreign exchange gains | (258) | (520)
Reclassification of debt | 1,433 | (1,222)
Deferred financing costs | (15) | (9)
Liabilities arising from financing activities at end of period | 13,812 | 12,884
Partnership Liability |  |
Reconciliation of movements of liabilities to cash flows arising from financing activities |  |
Liabilities arising from financing activities at beginning of period | 455 | 477
Changes from financing cash flows: |  |
Distributions to non-controlling interest | (10) | (7)
Reassessment of partnership liability | 9 | (15)
Liabilities arising from financing activities at end of period | 436 | 455
Dividends Payable |  |
Changes from financing cash flows: |  |
Dividends paid on common shares | (1,670) | (2,614)
Dividends declared on common shares | $ 1,670 | $ 2,614

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