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Equity Capital and Earnings Per Share - Summary of Further Information on Preferred Shares and Other Equity Instruments Outstanding (Detail) - CAD ($) shares in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Disclosure of classes of share capital [Line Items] |  |
Face amount | $ 395,957 | $ 440,098
Other equity interest [member] | Series 1(LRCN-Series 1) [member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Feb. 19, 2021 |
Annual dividend rate | 3.375% |
Earliest redemption date | May 19, 2026 |
Face amount | $ 2,000 |
Net amount | $ 1,982 | 1,982
Other equity interest [member] | Series 2 (LRCN-Series 2) [member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Nov. 12, 2021 |
Annual dividend rate | 4.10% |
Earliest redemption date | Feb. 19, 2027 |
Face amount | $ 1,200 |
Net amount | $ 1,189 | 1,189
Other equity interest [member] | Series 3(LRCN-Series 1) [member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Jun. 16, 2022 |
Annual dividend rate | 7.117% |
Earliest redemption date | Jun. 19, 2027 |
Face amount | $ 1,000 |
Net amount | $ 990 |
Class 1, Series 3 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Mar. 11, 2011 |
Annual dividend rate | 2.348% |
Earliest redemption date | Jun. 19, 2026 |
Number of shares | 7 |
Face amount | $ 163 |
Net amount | $ 160 | 160
Class 1, Series 4 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Jun. 20, 2016 |
Earliest redemption date | Jun. 19, 2026 |
Number of shares | 1 |
Face amount | $ 37 |
Net amount | $ 36 | 36
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 |
Net amount |  | 244
Class 1, Series 9 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | May 24, 2012 |
Annual dividend rate | 5.978% |
Earliest redemption date | Sep. 19, 2027 |
Number of shares | 10 |
Face amount | $ 250 |
Net amount | $ 244 | 244
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 |
Net amount | $ 196 | 196
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 |
Net amount | $ 196 | 196
Class 1, Series 15 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Feb. 25, 2014 |
Annual dividend rate | 3.786% |
Earliest redemption date | Jun. 19, 2024 |
Number of shares | 8 |
Face amount | $ 200 |
Net amount | $ 195 | 195
Class 1, Series 17 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Aug. 15, 2014 |
Annual dividend rate | 3.80% |
Earliest redemption date | Dec. 19, 2024 |
Number of shares | 14 |
Face amount | $ 350 |
Net amount | $ 343 | 343
Class 1, Series 19 Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Issue date | Dec. 03, 2014 |
Annual dividend rate | 3.675% |
Earliest redemption date | Mar. 19, 2025 |
Number of shares | 10 |
Face amount | $ 250 |
Net amount | $ 246 | 246
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 |
Net amount |  | 467
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 |
Net amount | $ 245 | 245
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 |
Net amount | $ 344 | 344
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 |
Net amount | $ 294 | 294
Preferred shares [Member] |  |
Disclosure of classes of share capital [Line Items] |  |
Number of shares | 131 |
Face amount | $ 7,475 |
Net amount | $ 6,660 | $ 6,381

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