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Common Shares - Issued and Outstanding (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of classes of share capital [line items]    
Proceeds from exercise of options $ 0 $ 2
Common shares    
Shares issued 15,068,900  
Dilutive effect of share options on number of ordinary shares 100,000 100,000
Common shares    
Disclosure of classes of share capital [line items]    
Issued and outstanding, end of year $ 2,978 $ 3,059
Proceeds from issuing shares (79) (83)
Effects of share-based payment plans (3) 0
Issued and outstanding, end of year $ 2,896 $ 2,978
Common shares    
Issued and outstanding, beginning of year 277,000,000.0 284,600,000
Shares issued (7,300,000) (7,700,000)
Issued and outstanding, end of year 269,800,000 277,000,000.0