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Share Capital and Earnings Per Share - Summary of Further Information on Preferred Shares Outstanding (Detail) - CAD ($) shares in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of classes of share capital [Line Items] |  |
Face amount | $ 414,734,000,000 | $ 336,773,000,000
Class 1, Series 4 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Jun. 20, 2016 |
Number of shares | 2 |
Face amount | $ 42,000,000 |
Net amount | $ 41,000,000 |
Class 1, Series 3 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Mar. 11, 2011 |
Annual dividend rate | 2.178% |
Earliest redemption date | Jun. 19, 2021 |
Number of shares | 6 |
Face amount | $ 158,000,000 |
Net amount | $ 155,000,000 |
Class 1, Series 5 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Dec. 06, 2011 |
Annual dividend rate | 3.891% |
Earliest redemption date | Dec. 19, 2021 |
Number of shares | 8 |
Face amount | $ 200,000,000 |
Net amount | $ 195,000,000 |
Class 1, Series 7 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Feb. 22, 2012 |
Annual dividend rate | 4.312% |
Earliest redemption date | Mar. 19, 2022 |
Number of shares | 10 |
Face amount | $ 250,000,000 |
Net amount | $ 244,000,000 |
Class 1, Series 9 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | May 24, 2012 |
Annual dividend rate | 4.351% |
Earliest redemption date | Sep. 19, 2022 |
Number of shares | 10 |
Face amount | $ 250,000,000 |
Net amount | $ 244,000,000 |
Class 1, Series 11 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Dec. 04, 2012 |
Annual dividend rate | 4.731% |
Earliest redemption date | Mar. 19, 2023 |
Number of shares | 8 |
Face amount | $ 200,000,000 |
Net amount | $ 196,000,000 |
Class 1, Series 13 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Jun. 21, 2013 |
Annual dividend rate | 4.414% |
Earliest redemption date | Sep. 19, 2023 |
Number of shares | 8 |
Face amount | $ 200,000,000 |
Net amount | $ 196,000,000 |
Class 1, Series 15 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Feb. 25, 2014 |
Annual dividend rate | 3.90% |
Earliest redemption date | Jun. 19, 2019 |
Number of shares | 8 |
Face amount | $ 200,000,000 |
Net amount | $ 195,000,000 |
Class 1, Series 17 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Aug. 15, 2014 |
Annual dividend rate | 3.90% |
Earliest redemption date | Dec. 19, 2019 |
Number of shares | 14 |
Face amount | $ 350,000,000 |
Net amount | $ 343,000,000 |
Class 1, Series 19 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Dec. 03, 2014 |
Annual dividend rate | 3.80% |
Earliest redemption date | Mar. 19, 2020 |
Number of shares | 10 |
Face amount | $ 250,000,000 |
Net amount | $ 246,000,000 |
Class 1, Series 21 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Feb. 25, 2016 |
Annual dividend rate | 5.60% |
Earliest redemption date | Jun. 19, 2021 |
Number of shares | 17 |
Face amount | $ 425,000,000 |
Net amount | $ 417,000,000 |
Class 1, Series 23 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Nov. 22, 2016 |
Annual dividend rate | 4.85% |
Earliest redemption date | Mar. 19, 2022 |
Number of shares | 19 |
Face amount | $ 475,000,000 |
Net amount | $ 467,000,000 |
Class 1, Series 25 Preferred Shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Feb. 20, 2018 |
Annual dividend rate | 4.70% |
Earliest redemption date | Jun. 19, 2023 |
Number of shares | 10 |
Face amount | $ 250,000,000 |
Net amount | $ 245,000,000 |
Class A, Series 2 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Feb. 18, 2005 |
Annual dividend rate | 4.65% |
Number of shares | 14 |
Face amount | $ 350,000,000 |
Net amount | $ 344,000,000 |
Class A, Series 3 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Jan. 03, 2006 |
Annual dividend rate | 4.50% |
Number of shares | 12 |
Face amount | $ 300,000,000 |
Net amount | $ 294,000,000 |
Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Number of shares | 156 |
Face amount | $ 3,900,000,000 |
Net amount | $ 3,822,000,000 |

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