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Summary of Significant Accounting Policies (Intangible Assets) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
CAD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2017 $ 8
2018 8
2019 8
2020 8
2021 8
Computer Software, Intangible Asset [Member]  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2017 6
2018 6
2019 6
2020 6
2021 6
Use Rights [Member]  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2017 1
2018 1
2019 1
2020 1
2021 1
Naming Rights [Member]  
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2017 1
2018 1
2019 1
2020 1
2021 $ 1
Minimum [Member] | Computer Software, Intangible Asset [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 3 years
Minimum [Member] | Use Rights [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 50 years
Minimum [Member] | Naming Rights [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 1 year
Maximum [Member] | Computer Software, Intangible Asset [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 15 years
Maximum [Member] | Use Rights [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 143 years
Maximum [Member] | Naming Rights [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 24 years