dividends per share (Details) - CAD ($) $ / shares in Units, $ in Millions |
3 Months Ended | 6 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Oct. 01, 2019 |
Aug. 01, 2019 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
|
| Dividends per share | ||||||||
| Dividends per share | $ 0.5625 | $ 0.5625 | $ 0.5450 | $ 0.5250 | $ 0.5050 | $ 1.1075 | $ 1.0300 | |
| Dividends Declared | $ 339 | $ 329 | $ 315 | $ 299 | $ 668 | $ 614 | ||
| Dividend Reinvestment and Share Purchase Plan | ||||||||
| Dividends per share | ||||||||
| Maximum discount on common shares (as a percent) | 5.00% | |||||||
| Offering price discount on Common Shares from Treasury (as a percent) | 2.00% | |||||||
| Dividend reinvestment in Common Shares | $ 15 | $ 14 | $ 28 | $ 27 | ||||
| Purchase plan discount | 0.00% | 0.00% | 0.00% | 0.00% | ||||