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Deferred tax assets and liabilities - Activity in deferred tax asset (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance $ 1,161 $ 1,026
Gross, deferred tax liabilities, beginning balance (1,778) (1,823)
Net, deferred tax liability (asset), beginning balance (617) (797)
(Charged)/credited to income 35 192
(Charged)/credited to equity (19) 8
(Charged) to other comprehensive income (43) (20)
Impact of business combination (66)  
Impact of asset acquisitions 57  
Gross deferred tax assets, ending balance 1,339 1,161
Gross, deferred tax liabilities, ending balance (1,992) (1,778)
Net, deferred tax liability (asset), ending balance (653) (617)
Property, plant & equipment    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 28 24
Gross, deferred tax liabilities, beginning balance (246) (215)
Net, deferred tax liability (asset), beginning balance (218) (191)
(Charged)/credited to income (57) (27)
(Charged)/credited to equity 0 0
(Charged) to other comprehensive income 0 0
Impact of business combination (1)  
Impact of asset acquisitions 0  
Gross deferred tax assets, ending balance 31 28
Gross, deferred tax liabilities, ending balance (307) (246)
Net, deferred tax liability (asset), ending balance (276) (218)
Intangible assets    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 5 5
Gross, deferred tax liabilities, beginning balance (1,382) (1,519)
Net, deferred tax liability (asset), beginning balance (1,377) (1,514)
(Charged)/credited to income 102 137
(Charged)/credited to equity 0 0
(Charged) to other comprehensive income 0 0
Impact of business combination (250)  
Impact of asset acquisitions 0  
Gross deferred tax assets, ending balance 4 5
Gross, deferred tax liabilities, ending balance (1,529) (1,382)
Net, deferred tax liability (asset), ending balance (1,525) (1,377)
Pensions and other benefit obligations of associates    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 116 128
Gross, deferred tax liabilities, beginning balance 0 0
Net, deferred tax liability (asset), beginning balance 116 128
(Charged)/credited to income 1 1
(Charged)/credited to equity 0 (2)
(Charged) to other comprehensive income (38) (11)
Impact of business combination 0  
Impact of asset acquisitions 0  
Gross deferred tax assets, ending balance 79 116
Gross, deferred tax liabilities, ending balance 0 0
Net, deferred tax liability (asset), ending balance 79 116
Inventories    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 372 381
Gross, deferred tax liabilities, beginning balance (23) (23)
Net, deferred tax liability (asset), beginning balance 349 358
(Charged)/credited to income (23) (9)
(Charged)/credited to equity 0 0
(Charged) to other comprehensive income 0 0
Impact of business combination 0  
Impact of asset acquisitions 0  
Gross deferred tax assets, ending balance 352 372
Gross, deferred tax liabilities, ending balance (26) (23)
Net, deferred tax liability (asset), ending balance 326 349
Tax loss carry-forwards    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 188 174
Gross, deferred tax liabilities, beginning balance 0 0
Net, deferred tax liability (asset), beginning balance 188 174
(Charged)/credited to income (168) 4
(Charged)/credited to equity 12 7
(Charged) to other comprehensive income 0 3
Impact of business combination 142  
Impact of asset acquisitions 57  
Gross deferred tax assets, ending balance 231 188
Gross, deferred tax liabilities, ending balance 0 0
Net, deferred tax liability (asset), ending balance 231 188
Other assets, provisions and accruals    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 452 314
Gross, deferred tax liabilities, beginning balance (127) (66)
Net, deferred tax liability (asset), beginning balance 325 248
(Charged)/credited to income 180 86
(Charged)/credited to equity (31) 3
(Charged) to other comprehensive income (5) (12)
Impact of business combination 43  
Impact of asset acquisitions 0  
Gross deferred tax assets, ending balance 642 452
Gross, deferred tax liabilities, ending balance (130) (127)
Net, deferred tax liability (asset), ending balance $ 512 $ 325