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Common Shares - Issued and Outstanding (Details) - Common shares - CAD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of classes of share capital [line items]    
Issued and outstanding, end of year $ 3,094 $ 3,095
Proceeds from issuing shares (35) 0
Issued Capital, Amount Before Receivables Under Employee Share Purchase Plan 3,059 3,095
Amounts receivable under Employee Share Purchase Plan 0 (1)
Issued and outstanding, end of year $ 3,059 $ 3,094
Common shares    
Issued and outstanding, beginning of year 287.9 287.9
Shares issued (3.3) 0.0
Issued and outstanding, end of year 284.6 287.9