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Share Capital (Details)
$ in Millions
 12 Months Ended
May 03, 2019
shares
Dec. 31, 2018
CAD ($)
$ / shares
Dec. 31, 2018
CAD ($)
shares
May 01, 2018
shares
Dec. 31, 2017
CAD ($)
$ / shares
Dec. 31, 2017
CAD ($)
shares
Jan. 01, 2019
CAD ($)
Share Capital              
Treasury shares authorized for repurchase | shares 52,285,330     50,079,795      
Amended treasury shares authorized for repurchase | shares 81,695,830            
Treasury share repurchase authorized amount             $ 2,000
Share repurchase activities (in shares) | shares     64,426,000     33,154,000  
Issued Capital     $ 3,053     $ 1,413  
Share repurchase cost     3,053     1,413  
Average repurchase cost per share | $ / shares   $ 47.38     $ 42.61    
Liability for share purchase commitment   $ 263 263   $ 277 277  
Share capital              
Share Capital              
Issued Capital     1,040     536  
Share repurchase cost     1,040     536  
Liability for share purchase commitment   111 111   97 97  
Retained earnings              
Share Capital              
Issued Capital     2,013     877  
Share repurchase cost     2,013     877  
Liability for share purchase commitment   $ 152 $ 152   $ 180 $ 180