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Financial assets and liabilities - Schedule of Foreign Currency Forward Contracts and Options (Details) - Jun. 30, 2026 - Currency risk ₱ in Millions, $ in Millions, $ in Millions | USD ($) | CAD ($) | PHP (₱)
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Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Loans | 2026 | Cash flow |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | $ 1,132 |  |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Commercial paper | 2026 | Cash flow |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 425 |  |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated purchases | 2026 | Cash flow |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 442 |  |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated purchases | 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 purchases | 2026 | Economic | Call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 60 |  |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated purchases | 2026 | Economic | Put options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 80 |  |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated purchases | 2027 | Cash flow |  |  |
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 purchases | 2027 | Economic | Options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 44 |  |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated purchases | 2027 | Economic | Call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 75 |  |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated purchases | 2027 | Economic | Put options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 60 |  |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated purchases | 2028 | Cash flow |  |  |
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 purchases | 2028 | Economic | Call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 0 |  |
Amount to receive | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated purchases | 2028 | Economic | 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 purchases | 2026 | Cash flow |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | ₱ |  |  | ₱ 4,752
Amount to receive | Foreign Currency Forward Contract Buy Canadian Dollar Sell United States Dollar | Anticipated purchases | 2026 | Economic | Call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | $ 261 |
Amount to receive | Foreign Currency Forward Contract Buy Canadian Dollar Sell United States Dollar | Anticipated purchases | 2026 | Economic | Put options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 67 |
Amount to receive | Foreign Currency Forward Contract Buy Canadian Dollar Sell United States Dollar | Anticipated purchases | 2028 | Economic | 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 | 2026 | Cash flow |  |  |
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 | 2026 | Cash flow |  |  |
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 purchases | 2026 | Cash flow |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 587 |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated purchases | 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 purchases | 2026 | Economic | Call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 79 |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated purchases | 2026 | Economic | Put options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 105 |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated purchases | 2027 | Cash flow |  |  |
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 purchases | 2027 | Economic | Options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 59 |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated purchases | 2027 | Economic | Call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 99 |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated purchases | 2027 | Economic | Put options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 79 |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated purchases | 2028 | Cash flow |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 156 |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated purchases | 2028 | Economic | Call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 7 |
Amount to pay | Foreign Currency Forward Contract Buy United States Dollar Sell Canadian Dollar | Anticipated purchases | 2028 | Economic | Put options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount |  | 156 |
Amount to pay | Foreign Currency Forward Contract Buy Philippines Peso Sell Canadian Dollar | Anticipated purchases | 2026 | Cash flow |  |  |
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 purchases | 2026 | Economic | Call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 180 |  |
Amount to pay | Foreign Currency Forward Contract Buy Canadian Dollar Sell United States Dollar | Anticipated purchases | 2026 | Economic | Put options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | 50 |  |
Amount to pay | Foreign Currency Forward Contract Buy Canadian Dollar Sell United States Dollar | Anticipated purchases | 2028 | Economic | Call options |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |
Notional amount | $ 240 |  |

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