Capital and Financing Transactions - Additional Information (Detail) - CAD ($) $ / shares in Units, shares in Millions, $ in Millions |
1 Months Ended | 3 Months Ended | 10 Months Ended | |||
|---|---|---|---|---|---|---|
Apr. 07, 2026 |
Apr. 02, 2026 |
May 28, 2025 |
Apr. 30, 2026 |
Apr. 30, 2026 |
Apr. 01, 2026 |
|
| Disclosure of objectives, policies and processes for managing capital [line items] | ||||||
| Number of shares repurchased and cancelled | 15.0 | 2.1 | 6.4 | 20.0 | ||
| Shares repurchased and cancelled, per share | $ 101.66 | $ 100.65 | $ 90.47 | |||
| Reduction of issued capital | $ 218 | $ 655 | $ 1,846 | |||
| Subordinated Debentures Redemption [Member] | ||||||
| Disclosure of objectives, policies and processes for managing capital [line items] | ||||||
| Cancellation of common shares | 15.0 | 20.0 |