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Financial risk management and derivative financial instruments - Disclosure of Short-term Deposits by Counterparty Credit Rating (Detail) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of credit risk exposure [line items]    
Short-term deposits $ 515 $ 411
Money market funds 334 415
Repurchase agreements 100 40
AAA    
Disclosure of credit risk exposure [line items]    
Short-term deposits 0 0
Money market funds 334 415
Repurchase agreements 71 26
AA+    
Disclosure of credit risk exposure [line items]    
Short-term deposits 0 0
Money market funds 0 0
Repurchase agreements 0 9
AA    
Disclosure of credit risk exposure [line items]    
Short-term deposits 0 0
Money market funds 0 0
Repurchase agreements 14 2
AA-    
Disclosure of credit risk exposure [line items]    
Short-term deposits 94 41
Money market funds 0 0
Repurchase agreements 15 3
A+    
Disclosure of credit risk exposure [line items]    
Short-term deposits 245 107
Money market funds 0 0
Repurchase agreements 0 0
A    
Disclosure of credit risk exposure [line items]    
Short-term deposits 166 249
Money market funds 0 0
Repurchase agreements 0 0
A-    
Disclosure of credit risk exposure [line items]    
Short-term deposits 0 0
Money market funds 0 0
Repurchase agreements 0 0
BBB+ and below    
Disclosure of credit risk exposure [line items]    
Short-term deposits 10 14
Money market funds 0 0
Repurchase agreements $ 0 $ 0