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Common Shares - Issued and Outstanding (Details) - CAD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of classes of share capital [line items]    
Proceeds from exercise of options $ 8 $ 0
Common shares    
Dilutive effect of share options on number of ordinary shares 1.2 0.1
Common shares    
Disclosure of classes of share capital [line items]    
Issued and outstanding, end of year $ 2,896 $ 2,978
Proceeds from issuing shares 0 (79)
Effects of share-based payment plans (3) (3)
Issued and outstanding, end of year $ 2,901 $ 2,896
Common shares    
Issued and outstanding, beginning of year 269.8 277.0
Shares issued 0.0 (7.3)
Issued and outstanding, end of year 271.0 269.8