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financial instruments - Derivative gains and losses (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Derivative assets |  |  |  |  |
financial instruments |  |  |  |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | $ 75 | $ (308) | $ 250 | $ (306) |
Gain (loss) reclassified from other comprehensive income to income (effective portion) | 222 | (325) | 397 | (317) |
Derivative assets | Currency risk |  |  |  |  |
financial instruments |  |  |  |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | 67 | (343) | 268 | (323) |
Gain (loss) reclassified from other comprehensive income to income (effective portion) | 220 | (326) | 394 | (320) |
Derivative assets | Other market risk |  |  |  |  |
financial instruments |  |  |  |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | 8 | 35 | (18) | 17 |
Gain (loss) reclassified from other comprehensive income to income (effective portion) | 2 | 1 | 3 | 3 |
Derivatives held for hedging | Currency risk related to purchases | U.S. Dollars | Goods and services purchased |  |  |  |  |
financial instruments |  |  |  |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | 10 | (24) | 21 | (23) |
Gain (loss) reclassified from other comprehensive income to income (effective portion) | 3 | 1 |  | 7 |
Derivatives held for hedging | Currency risk related to long-term debt | U.S. Dollars | Financing costs |  |  |  |  |
financial instruments |  |  |  |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | 57 | (268) | 247 | (228) |
Gain (loss) reclassified from other comprehensive income to income (effective portion) | 217 | (328) | 394 | (333) |
Spread included in fair value of derivative instruments | 10 | 8 | 15 | (8) |
Derivatives held for hedging | Currency risk related to investment in a foreign operation | Financing costs |  |  |  |  |
financial instruments |  |  |  |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) |  | (51) |  | (72) |
Gain (loss) reclassified from other comprehensive income to income (effective portion) |  | 1 |  | 6 |
Derivatives held for hedging | Other market risk | Financing costs |  |  |  |  |
financial instruments |  |  |  |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) |  |  |  | (2) |
Gain (loss) reclassified from other comprehensive income to income (effective portion) |  | 1 |  | 1 |
Derivatives held for trading | Currency risk | Financing costs |  |  |  |  |
financial instruments |  |  |  |  |
Gain (loss) on derivatives recognized in income | (7) | (1) | (8) | (6) |
Cash flow hedges | Derivative assets | Currency risk related to long-term debt | U.S. Dollars |  |  |  |  |
financial instruments |  |  |  |  |
Spread included in fair value of derivative instruments |  |  | (24) |  | $ (22)
Cash flow hedges | Derivatives held for hedging |  |  |  |  |
financial instruments |  |  |  |  |
Ineffective portion of derivative instruments classified as cash flow hedging items | 0 | 0 | 0 | 0 |
Cash flow hedges | Derivatives held for hedging | Other market risk | Goods and services purchased |  |  |  |  |
financial instruments |  |  |  |  |
Amount of gain (loss) recognized in other comprehensive income (effective portion) | 8 | 35 | (18) | 19 |
Gain (loss) reclassified from other comprehensive income to income (effective portion) | 2 |  | $ 3 | 2 |
Ineffective portion of derivative instruments classified as cash flow hedging items | $ (1) | $ 2 |  | $ 3 |

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