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Financial risk management and derivative financial instruments - Summary of Undiscounted Contractual Cash Flows of Financial Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Non-derivative financial liabilities:    
Lease liabilities $ 3,366 $ 3,403
Forward currency contract inflows [Member]    
Derivative financial instruments:    
Currency swaps hedging (431) (438)
Forward currency contract outflows [Member]    
Derivative financial instruments:    
Currency swaps hedging 425 425
Currency swaps hedging bonds inflows [member]    
Derivative financial instruments:    
Currency swaps hedging (2,293) (2,003)
Currency swaps hedging bonds outflows [member]    
Derivative financial instruments:    
Currency swaps hedging 2,574 2,112
Deferred and contingent purchase consideration [member]    
Non-derivative financial liabilities:    
Non-derivative financial liabilities   94
Bank Overdrafts [member]    
Non-derivative financial liabilities:    
Borrowings 17 44
Trade Payables [Member]    
Non-derivative financial liabilities:    
Non-derivative financial liabilities 594 657
Bonds [member]    
Non-derivative financial liabilities:    
Non-derivative financial liabilities 3,709 3,483
Contingent purchase consideration [Member]    
Non-derivative financial liabilities:    
Non-derivative financial liabilities 81  
Financial Guarantee Contracts [member]    
Non-derivative financial liabilities:    
Non-derivative financial liabilities 31 50
Due within one year [member]    
Non-derivative financial liabilities:    
Lease liabilities 52 57
Due within one year [member] | Currency swaps hedging bonds inflows [member]    
Derivative financial instruments:    
Currency swaps hedging (66) (604)
Due within one year [member] | Currency swaps hedging bonds outflows [member]    
Derivative financial instruments:    
Currency swaps hedging 101 653
Due within one year [member] | Deferred and contingent purchase consideration [member]    
Non-derivative financial liabilities:    
Non-derivative financial liabilities   13
Due within one year [member] | Bank Overdrafts [member]    
Non-derivative financial liabilities:    
Borrowings 17 44
Due within one year [member] | Trade Payables [Member]    
Non-derivative financial liabilities:    
Non-derivative financial liabilities 589 651
Due within one year [member] | Bonds [member]    
Non-derivative financial liabilities:    
Non-derivative financial liabilities 482 644
Due within one year [member] | Financial Guarantee Contracts [member]    
Non-derivative financial liabilities:    
Non-derivative financial liabilities 31 50
Between 1 and 2 years [member]    
Non-derivative financial liabilities:    
Lease liabilities 50 52
Between 1 and 2 years [member] | Currency swaps hedging bonds inflows [member]    
Derivative financial instruments:    
Currency swaps hedging (66) (41)
Between 1 and 2 years [member] | Currency swaps hedging bonds outflows [member]    
Derivative financial instruments:    
Currency swaps hedging 100 59
Between 1 and 2 years [member] | Trade Payables [Member]    
Non-derivative financial liabilities:    
Non-derivative financial liabilities 1 1
Between 1 and 2 years [member] | Bonds [member]    
Non-derivative financial liabilities:    
Non-derivative financial liabilities 531 464
Between 1 and 2 years [member] | Contingent purchase consideration [Member]    
Non-derivative financial liabilities:    
Non-derivative financial liabilities 39  
After two but before five years [member]    
Non-derivative financial liabilities:    
Lease liabilities 139 130
After two but before five years [member] | Forward currency contract inflows [Member]    
Derivative financial instruments:    
Currency swaps hedging (431) (438)
After two but before five years [member] | Forward currency contract outflows [Member]    
Derivative financial instruments:    
Currency swaps hedging 425 425
After two but before five years [member] | Currency swaps hedging bonds inflows [member]    
Derivative financial instruments:    
Currency swaps hedging (1,324) (664)
After two but before five years [member] | Currency swaps hedging bonds outflows [member]    
Derivative financial instruments:    
Currency swaps hedging 1,457 704
After two but before five years [member] | Deferred and contingent purchase consideration [member]    
Non-derivative financial liabilities:    
Non-derivative financial liabilities   81
After two but before five years [member] | Trade Payables [Member]    
Non-derivative financial liabilities:    
Non-derivative financial liabilities 1 3
After two but before five years [member] | Bonds [member]    
Non-derivative financial liabilities:    
Non-derivative financial liabilities 1,859 1,681
After two but before five years [member] | Contingent purchase consideration [Member]    
Non-derivative financial liabilities:    
Non-derivative financial liabilities 42  
More than 5 years [member]    
Non-derivative financial liabilities:    
Lease liabilities 3,125 3,164
More than 5 years [member] | Currency swaps hedging bonds inflows [member]    
Derivative financial instruments:    
Currency swaps hedging (837) (694)
More than 5 years [member] | Currency swaps hedging bonds outflows [member]    
Derivative financial instruments:    
Currency swaps hedging 916 696
More than 5 years [member] | Trade Payables [Member]    
Non-derivative financial liabilities:    
Non-derivative financial liabilities 3 2
More than 5 years [member] | Bonds [member]    
Non-derivative financial liabilities:    
Non-derivative financial liabilities $ 837 $ 694