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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 (₱)
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