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Deferred tax assets and liabilities - Activity in deferred tax asset (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance $ 1,580 $ 1,339
Gross, deferred tax liabilities, beginning balance (1,934) (1,992)
Net, deferred tax asset (liabilities), beginning balance (354) (653)
(Charged)/credited to income 96 309
Credited/(charged) to equity 7 (12)
Credited/(charged) to other comprehensive income (41) 2
Impact of business combinations (11)  
Gross deferred tax assets, ending balance 1,558 1,580
Gross, deferred tax liabilities, ending balance (1,861) (1,934)
Net, deferred tax asset (liabilities), ending balance (303) (354)
Property, plant & equipment    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 39 31
Gross, deferred tax liabilities, beginning balance (337) (307)
Net, deferred tax asset (liabilities), beginning balance (298) (276)
(Charged)/credited to income (1) (22)
Credited/(charged) to equity 0 0
Credited/(charged) to other comprehensive income 1 0
Impact of business combinations 0  
Gross deferred tax assets, ending balance 34 39
Gross, deferred tax liabilities, ending balance (332) (337)
Net, deferred tax asset (liabilities), ending balance (298) (298)
Intangible assets and deductible goodwill    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 267 4
Gross, deferred tax liabilities, beginning balance (1,417) (1,529)
Net, deferred tax asset (liabilities), beginning balance (1,150) (1,525)
(Charged)/credited to income 95 375
Credited/(charged) to equity 0 0
Credited/(charged) to other comprehensive income 0 0
Impact of business combinations (17)  
Gross deferred tax assets, ending balance 246 267
Gross, deferred tax liabilities, ending balance (1,318) (1,417)
Net, deferred tax asset (liabilities), ending balance (1,072) (1,150)
Pensions and other benefit obligations of associates    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 85 79
Gross, deferred tax liabilities, beginning balance 0 0
Net, deferred tax asset (liabilities), beginning balance 85 79
(Charged)/credited to income 2 0
Credited/(charged) to equity 0 0
Credited/(charged) to other comprehensive income (7) 6
Impact of business combinations 0  
Gross deferred tax assets, ending balance 80 85
Gross, deferred tax liabilities, ending balance 0 0
Net, deferred tax asset (liabilities), ending balance 80 85
Inventories    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 377 352
Gross, deferred tax liabilities, beginning balance (30) (26)
Net, deferred tax asset (liabilities), beginning balance 347 326
(Charged)/credited to income 11 21
Credited/(charged) to equity 0 0
Credited/(charged) to other comprehensive income (7) 0
Impact of business combinations 0  
Gross deferred tax assets, ending balance 384 377
Gross, deferred tax liabilities, ending balance (33) (30)
Net, deferred tax asset (liabilities), ending balance 351 347
Tax loss carry-forwards    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 194 231
Gross, deferred tax liabilities, beginning balance 0 0
Net, deferred tax asset (liabilities), beginning balance 194 231
(Charged)/credited to income (15) (40)
Credited/(charged) to equity 2 3
Credited/(charged) to other comprehensive income 0 0
Impact of business combinations 6  
Gross deferred tax assets, ending balance 187 194
Gross, deferred tax liabilities, ending balance 0 0
Net, deferred tax asset (liabilities), ending balance 187 194
Other assets, provisions and accruals    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 618 642
Gross, deferred tax liabilities, beginning balance (150) (130)
Net, deferred tax asset (liabilities), beginning balance 468 512
(Charged)/credited to income 4 (25)
Credited/(charged) to equity 5 (15)
Credited/(charged) to other comprehensive income (28) (4)
Impact of business combinations 0  
Gross deferred tax assets, ending balance 627 618
Gross, deferred tax liabilities, ending balance (178) (150)
Net, deferred tax asset (liabilities), ending balance $ 449 $ 468