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Debt And Credit Facilities- Scheduled debt repayments (Details)
$ in Millions
Dec. 31, 2018
CAD ($)
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Scheduled principal repayments for finance leases, short term debt and long term debt $ 17,455.0
2019  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Scheduled principal repayments for finance leases, short term debt and long term debt 3,459.0
2020  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Scheduled principal repayments for finance leases, short term debt and long term debt 39.0
2021  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Scheduled principal repayments for finance leases, short term debt and long term debt 1,501.0
2022  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Scheduled principal repayments for finance leases, short term debt and long term debt 295.0
2023  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Scheduled principal repayments for finance leases, short term debt and long term debt 53.0
Thereafter  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Scheduled principal repayments for finance leases, short term debt and long term debt $ 12,108.0