XML 196 R102.htm IDEA: XBRL DOCUMENT v3.10.0.1
dividends per share (Details) - CAD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Aug. 02, 2018
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dividends per share                      
Dividends per share $ 0.5450 $ 0.5450 $ 0.5250 $ 0.5250 $ 0.5050 $ 0.5050 $ 0.4925 $ 0.4925 $ 0.4800 $ 2.1000 $ 1.9700
Dividends Declared   $ 326 $ 313 $ 315 $ 299 $ 299 $ 292 $ 293 $ 283 $ 1,253 $ 1,167
Dividend Reinvestment and Share Purchase Plan                      
Dividends per share                      
Dividend reinvestment in Common Shares                   $ 54 $ 58
Purchase plan discount                   0.00% 0.00%