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Common Share capital (Details)
shares in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2018
CAD ($)
shares
Jul. 31, 2018
CAD ($)
Nov. 30, 2017
CAD ($)
shares
Dec. 31, 2018
Vote
shares
Dec. 31, 2017
shares
Common Share capital          
Minimum percentage of common shares issued and outstanding owned by Canadians       66.667%  
Common shares reserved for issuance 47     47  
First Preferred Shares          
Common Share capital          
Shares authorized 1,000     1,000 1,000
Second Preferred Shares          
Common Share capital          
Shares authorized 1,000     1,000 1,000
Common Shares          
Common Share capital          
Shares authorized 2,000     2,000 2,000
Number of votes per common share | Vote       1  
Common Shares | Maximum          
Common Share capital          
Purchase of common shares related to normal course issuer bid 8   8    
Cost of purchase of common shares related to normal course issuer bid | $ $ 250   $ 250    
Common Shares | Maximum | Wholly owned subsidiary          
Common Share capital          
Cost of purchase of common shares related to normal course issuer bid | $   $ 105