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Supplemental Cash Flow Information - Reconciliation of movements of liabilities to cash flows (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
CAD ($)
Short-Term Debt  
Reconciliation of movements of liabilities to cash flows arising from financing activities  
Liabilities arising from financing activities at beginning of period $ 2,136
Changes from financing cash flows:  
Net issuance of commercial paper 866
Realized foreign exchange losses 131
Unrealized foreign exchange losses 98
Liabilities arising from financing activities at end of period 3,231
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 71
Changes from financing cash flows:  
Repayment of long-term debt (109)
Realized foreign exchange losses 1
Unrealized foreign exchange losses 9
Reclassification from long-term debt to current portion of long-term debt 257
Liabilities arising from financing activities at end of period 229
Long-Term Debt  
Reconciliation of movements of liabilities to cash flows arising from financing activities  
Liabilities arising from financing activities at beginning of period 13,372
Changes from financing cash flows:  
Payment of finance lease liabilities (74)
Unrealized foreign exchange losses 851
Deferred financing costs (14)
Modification to finance lease liabilities 12
Reclassification from long-term debt to current portion of long-term debt (257)
Liabilities arising from financing activities at end of period 13,890
Partnership Liability  
Reconciliation of movements of liabilities to cash flows arising from financing activities  
Liabilities arising from financing activities at beginning of period 483
Changes from financing cash flows:  
Distributions to non-controlling interest (6)
Liabilities arising from financing activities at end of period 477
Dividends Payable  
Changes from financing cash flows:  
Dividends paid on common shares (2,333)
Dividends declared on common shares $ 2,333