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Deferred tax assets and liabilities - Activity in deferred tax asset (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance $ 1,339 $ 1,161
Gross, deferred tax liabilities, beginning balance (1,992) (1,778)
Net, deferred tax liability (asset), beginning balance (653) (617)
(Charged)/credited to income 309 35
Credited/(charged) to equity (12) (19)
Credited/(charged) to other comprehensive income 2 (43)
Impact of business combination   (66)
Impact of asset acquisitions   57
Gross deferred tax assets, ending balance 1,580 1,339
Gross, deferred tax liabilities, ending balance (1,934) (1,992)
Net, deferred tax liability (asset), ending balance (354) (653)
Property, plant & equipment    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 31 28
Gross, deferred tax liabilities, beginning balance (307) (246)
Net, deferred tax liability (asset), beginning balance (276) (218)
(Charged)/credited to income (22) (57)
Credited/(charged) to equity 0 0
Credited/(charged) to other comprehensive income 0 0
Impact of business combination   (1)
Impact of asset acquisitions   0
Gross deferred tax assets, ending balance 39 31
Gross, deferred tax liabilities, ending balance (337) (307)
Net, deferred tax liability (asset), ending balance (298) (276)
Intangible assets and deductible goodwill    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 4 5
Gross, deferred tax liabilities, beginning balance (1,529) (1,382)
Net, deferred tax liability (asset), beginning balance (1,525) (1,377)
(Charged)/credited to income 375 102
Credited/(charged) to equity 0 0
Credited/(charged) to other comprehensive income 0 0
Impact of business combination   (250)
Impact of asset acquisitions   0
Gross deferred tax assets, ending balance 267 4
Gross, deferred tax liabilities, ending balance (1,417) (1,529)
Net, deferred tax liability (asset), ending balance (1,150) (1,525)
Pensions and other benefit obligations of associates    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 79 116
Gross, deferred tax liabilities, beginning balance 0 0
Net, deferred tax liability (asset), beginning balance 79 116
(Charged)/credited to income 0 1
Credited/(charged) to equity 0 0
Credited/(charged) to other comprehensive income 6 (38)
Impact of business combination   0
Impact of asset acquisitions   0
Gross deferred tax assets, ending balance 85 79
Gross, deferred tax liabilities, ending balance 0 0
Net, deferred tax liability (asset), ending balance 85 79
Inventories    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 352 372
Gross, deferred tax liabilities, beginning balance (26) (23)
Net, deferred tax liability (asset), beginning balance 326 349
(Charged)/credited to income 21 (23)
Credited/(charged) to equity 0 0
Credited/(charged) to other comprehensive income 0 0
Impact of business combination   0
Impact of asset acquisitions   0
Gross deferred tax assets, ending balance 377 352
Gross, deferred tax liabilities, ending balance (30) (26)
Net, deferred tax liability (asset), ending balance 347 326
Tax loss carry-forwards    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 231 188
Gross, deferred tax liabilities, beginning balance 0 0
Net, deferred tax liability (asset), beginning balance 231 188
(Charged)/credited to income (40) (168)
Credited/(charged) to equity 3 12
Credited/(charged) to other comprehensive income 0 0
Impact of business combination   142
Impact of asset acquisitions   57
Gross deferred tax assets, ending balance 194 231
Gross, deferred tax liabilities, ending balance 0 0
Net, deferred tax liability (asset), ending balance 194 231
Other assets, provisions and accruals    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 642 452
Gross, deferred tax liabilities, beginning balance (130) (127)
Net, deferred tax liability (asset), beginning balance 512 325
(Charged)/credited to income (25) 180
Credited/(charged) to equity (15) (31)
Credited/(charged) to other comprehensive income (4) (5)
Impact of business combination   43
Impact of asset acquisitions   0
Gross deferred tax assets, ending balance 618 642
Gross, deferred tax liabilities, ending balance (150) (130)
Net, deferred tax liability (asset), ending balance $ 468 $ 512