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Common Shares - Issued and Outstanding (Details) - CAD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of classes of share capital [line items]    
Stock options exercised $ 3 $ 8
Common shares    
Stock options exercised 0.5 1.2
Common shares    
Disclosure of classes of share capital [line items]    
Issued and outstanding, end of year $ 2,901 $ 2,896
Purchased and cancelled under the NCIB (46) 0
Effects of share-based payment plans 5 (3)
Issued and outstanding, end of year $ 2,863 $ 2,901
Common shares    
Issued and outstanding, beginning of year 271.0 269.8
Purchased and cancelled under the NCIB (4.3) 0.0
Effects of share-based payment plans 0.9 0.0
Issued and outstanding, end of year 268.1 271.0