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Financial and capital management - Schedule of Foreign Currency Forward Contracts and Options (Details) - Dec. 31, 2024 ₱ 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 2025 | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | $ 1,117 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Commercial paper | Maturing in 2025 | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 1,533 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2025 | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 671 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2025 | Economic | Interest rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 280 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2025 | Economic | Interest rate risk | Options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 270 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2025 | Economic | Interest rate risk | Purchased call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 500 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2025 | Economic | Interest rate risk | Written put options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 780 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2026 | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 509 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2026 | Economic | Interest rate risk | Swaps |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 102 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2026 | Economic | Interest rate risk | 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 | Interest rate risk | Written put 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 | Interest rate risk | Swaps |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 200 |
Amount to receive | Foreign Currency Forward Contract Buy Philippines Peso Sell Canadian Dollar | Anticipated Transactions | Maturing in 2025 | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | ₱ |  |  | ₱ 3,193
Amount to receive | Foreign Currency Forward Contract Buy Canadian Dollar Sell United States Dollar | Anticipated Transactions | Maturing in 2025 | Economic | Interest rate risk | Swaps |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 423 |
Amount to receive | Foreign Currency Forward Contract Buy Canadian Dollar Sell United States Dollar | Anticipated Transactions | Maturing in 2026 | Economic | Interest rate risk | Purchased call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | $ 348 |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Loans | Maturing in 2025 | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | $ 1,606 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Commercial paper | Maturing in 2025 | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 2,154 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2025 | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 873 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2025 | Economic | Interest rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 375 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2025 | Economic | Interest rate risk | Options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 353 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2025 | Economic | Interest rate risk | Purchased call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 675 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2025 | Economic | Interest rate risk | Written put options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 1,044 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2026 | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 677 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2026 | Economic | Interest rate risk | Swaps |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 140 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2026 | Economic | Interest rate risk | 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 | Interest rate risk | Written put 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 | Interest rate risk | Swaps |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 275 |  |
Amount to pay | Foreign Currency Forward Contract Buy Philippines Peso Sell Canadian Dollar | Anticipated Transactions | Maturing in 2025 | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 75 |  |
Amount to pay | Foreign Currency Forward Contract Buy Canadian Dollar Sell United States Dollar | Anticipated Transactions | Maturing in 2025 | Economic | Interest rate risk | Swaps |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 302 |  |
Amount to pay | Foreign Currency Forward Contract Buy Canadian Dollar Sell United States Dollar | Anticipated Transactions | Maturing in 2026 | Economic | Interest rate risk | Purchased call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | $ 240 |  |

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