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Trade receivables - Movement in provision for trade receivables (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Balance as of January 1 $ 3,893    
Balance as of December 31 4,674 $ 3,893  
Trade receivables      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Balance as of January 1 1,770    
Balance as of December 31 1,736 1,770  
Trade receivables | Provision      
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]      
Balance as of January 1 (44) (57) $ (55)
Provisions for doubtful trade receivables charged to the Consolidated Income Statement (24) (26) (40)
Utilization of provisions for doubtful trade receivables 6 14 7
Reversal of provisions for doubtful trade receivables 19 26 28
Currency translation effects 2 (1) 3
Balance as of December 31 $ (41) $ (44) $ (57)