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Financial and capital management - Schedule of Foreign Currency Forward Contracts and Options (Details) - Dec. 31, 2025 - Currency risk ₱ in Millions, $ in Millions, $ in Millions | CAD ($) | USD ($) | PHP (₱)
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Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Loans | Maturing in 2026 | Cash flow hedges |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | $ 1,167 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Commercial paper | Maturing in 2026 | Cash flow hedges |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 1,874 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2026 | Cash flow hedges |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 641 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2026 | Economic | Options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 10 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2026 | Economic | Purchased call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 120 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2026 | Economic | Written put options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 161 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2027 | Cash flow hedges |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 440 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2027 | Economic | Options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 100 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2027 | Economic | Purchased call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 150 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2027 | Economic | Written put options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 120 |
Amount to receive | Foreign Currency Forward Contract Buy Philippines Peso Sell Canadian Dollar | Anticipated Transactions | Maturing in 2026 | Cash flow hedges |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | ₱ |  |  | ₱ 3,299
Amount to receive | Foreign Currency Forward Contract Buy Canadian Dollar Sell United States Dollar | Anticipated Transactions | Maturing in 2026 | Economic | Purchased call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 348 |
Amount to receive | Foreign Currency Forward Contract Buy Canadian Dollar Sell United States Dollar | Anticipated Transactions | Maturing in 2026 | Economic | Written put options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 148 |
Amount to receive | Foreign Currency Forward Contract Buy Canadian Dollar Sell United States Dollar | Anticipated Transactions | Maturing in 2028 | Economic | Purchased call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | $ 360 |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Loans | Maturing in 2026 | Cash flow hedges |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | $ 1,604 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Commercial paper | Maturing in 2026 | Cash flow hedges |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 2,602 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2026 | Cash flow hedges |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 852 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2026 | Economic | Options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 13 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2026 | Economic | Purchased call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 158 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2026 | Economic | Written put options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 212 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2027 | Cash flow hedges |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 589 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2027 | Economic | Options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 135 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2027 | Economic | Purchased call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 197 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2027 | Economic | Written put options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 158 |  |
Amount to pay | Foreign Currency Forward Contract Buy Philippines Peso Sell Canadian Dollar | Anticipated Transactions | Maturing in 2026 | Cash flow hedges |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 79 |  |
Amount to pay | Foreign Currency Forward Contract Buy Canadian Dollar Sell United States Dollar | Anticipated Transactions | Maturing in 2026 | Economic | Purchased call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 240 |  |
Amount to pay | Foreign Currency Forward Contract Buy Canadian Dollar Sell United States Dollar | Anticipated Transactions | Maturing in 2026 | Economic | Written put options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 110 |  |
Amount to pay | Foreign Currency Forward Contract Buy Canadian Dollar Sell United States Dollar | Anticipated Transactions | Maturing in 2028 | Economic | Purchased call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | $ 240 |  |

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