Share capital (Repurchase of Common Shares) (Details) - CAD ($) $ / shares in Units, shares in Millions, $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Repurchase of common shares | |||
| Number of common shares repurchased (in shares) | 14.9 | 15.4 | 29.1 |
| Weighted-average price per share (including brokerage fees) (in dollars per share) | $ 137.51 | $ 172.07 | $ 156.37 |
| Amount of repurchase (including brokerage fees) | $ 2,047 | $ 2,651 | $ 4,551 |
| Share Repurchase Program (02/04/2025-02/03/2026) | |||
| Repurchase of common shares | |||
| NCIB February 4, 2025 - February 3, 2026 (in shares) | 20.0 | ||
| Number of common shares repurchased (in shares) | 14.3 | ||
| Accrued liabilities | $ 39 | $ 51 | |
| X | ||||||||||
- Definition Number of shares authorized to be purchased under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Number of shares that have been repurchased and retired during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Total cost of shares repurchased divided by the total number of shares repurchased. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|