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Classification and measurement of financial instruments - Summary of Carrying Amounts and Fair Values of Financial Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of fair value measurement of assets [line items]    
Other financial assets $ 212 $ 185
Level 1 [member]    
Disclosure of fair value measurement of assets [line items]    
Other financial assets 43 14
Level 3 [member]    
Disclosure of fair value measurement of assets [line items]    
Other financial assets 126 110
Derivative financial instruments [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities, at fair value (78) 25
Financial Liabilities (78) 25
Deferred compensation plan liabilities [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities, at fair value (286) 250
Financial Liabilities (286) 250
Loans and other borrowings [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities at amortised cost (3,274) (3,166)
Financial Liabilities (3,274) 3,166
Trade and other payables [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities, at fair value (73) 69
Financial liabilities at amortised cost (594) (670)
Financial liabilities, Not categorised as a financial instrument (61) 47
Financial Liabilities (728) 786
Other financial assets [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 169 124
Financial assets at amortised cost 50 68
Financial assets 219 192
Cash and cash equivalent [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 415 375
Financial assets at amortised cost 593 947
Financial assets 1,008 1,322
Derivative financial instruments [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 4 20
Financial assets 4 20
Deferred Compensation Plan Investments [Member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets, at fair value 286 250
Financial assets 286 250
Trade and other receivables [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets at amortised cost 697 651
Financial assets, Not categorised as a financial instrument 123 102
Financial assets 820 753
Equity Security [Member]    
Disclosure of fair value measurement of assets [line items]    
Other financial assets $ 89 $ 87