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Financial and capital management - Schedule of Foreign Currency Forward Contracts and Options (Details) - Dec. 31, 2023 ₱ 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 2024 | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | $ 1,207 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Commercial paper | Maturing in 2024 | Cash flow hedges | Currency risk |  |  |
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 2024 | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 624 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2024 | Economic | Interest rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 210 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2024 | Economic | Interest rate risk | Purchased call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 244 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2024 | Economic | Interest rate risk | Written put options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 519 |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2024 | Economic | Interest rate risk | Options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 175 |
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 |  | 495 |
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 |  | 120 |
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 |  | 540 |
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 |  | 360 |
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 |  | 65 |
Amount to receive | Foreign Currency Forward Contract Buy Philippines Peso Sell Canadian Dollar | Anticipated Transactions | Maturing in 2024 | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | ₱ |  |  | ₱ 2,885
Amount to receive | Foreign Currency Forward Contract Buy Canadian Dollar Sell United States Dollar | Anticipated Transactions | Maturing in 2024 | Economic | Interest rate risk | Purchased call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | $ 225 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Loans | Maturing in 2024 | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 1,609 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Commercial paper | Maturing in 2024 | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 201 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2024 | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 790 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2024 | Economic | Interest rate risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 277 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2024 | Economic | Interest rate risk | Purchased call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 327 |  |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated Transactions | Maturing in 2024 | Economic | Interest rate risk | Written put 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 2024 | Economic | Interest rate risk | Options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 225 |  |
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 | 645 |  |
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 | 158 |  |
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 | 694 |  |
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 | 461 |  |
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 | 85 |  |
Amount to pay | Foreign Currency Forward Contract Buy Philippines Peso Sell Canadian Dollar | Anticipated Transactions | Maturing in 2024 | Cash flow hedges | Currency risk |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | $ 69 |  |
Amount to pay | Foreign Currency Forward Contract Buy Canadian Dollar Sell United States Dollar | Anticipated Transactions | Maturing in 2024 | Economic | Interest rate risk | Purchased call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | $ 156 |

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