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Deferred tax assets and liabilities - Activity in deferred tax asset (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance $ 932 $ 673
Gross, deferred tax liabilities, beginning balance (1,964) (1,531)
Net, deferred tax liability (asset), beginning balance (1,032) (858)
(Charged)/credited to income 223 (122)
Credited/(charged) to equity (4) 25
Credited to other comprehensive income 16 16
Impact of business combinations   (93)
Other movements   0
Gross deferred tax assets, ending balance 1,026 932
Gross, deferred tax liabilities, ending balance (1,823) (1,964)
Net, deferred tax liability (asset), ending balance (797) (1,032)
Property, Plant, & Equipment Related Temporary Differences [Member]    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 13 12
Gross, deferred tax liabilities, beginning balance (172) (94)
Net, deferred tax liability (asset), beginning balance (159) (82)
(Charged)/credited to income (32) (71)
Credited/(charged) to equity 0 0
Credited to other comprehensive income 0 0
Impact of business combinations   0
Other movements   (6)
Gross deferred tax assets, ending balance 24 13
Gross, deferred tax liabilities, ending balance (215) (172)
Net, deferred tax liability (asset), ending balance (191) (159)
Intangible Assets Related Temporary Differences [Member]    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 6 0
Gross, deferred tax liabilities, beginning balance (1,713) (1,403)
Net, deferred tax liability (asset), beginning balance (1,707) (1,403)
(Charged)/credited to income 193 (194)
Credited/(charged) to equity 0 0
Credited to other comprehensive income 0 0
Impact of business combinations   (121)
Other movements   11
Gross deferred tax assets, ending balance 5 6
Gross, deferred tax liabilities, ending balance (1,519) (1,713)
Net, deferred tax liability (asset), ending balance (1,514) (1,707)
Pensions And Other Benefit Obligations Of Associates Related Temporary Differences [Member]    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 151 125
Gross, deferred tax liabilities, beginning balance (10) (2)
Net, deferred tax liability (asset), beginning balance 141 123
(Charged)/credited to income (33) 18
Credited/(charged) to equity 7 0
Credited to other comprehensive income 13 11
Impact of business combinations   0
Other movements   (11)
Gross deferred tax assets, ending balance 128 151
Gross, deferred tax liabilities, ending balance 0 (10)
Net, deferred tax liability (asset), ending balance 128 141
Inventories Related Temporary Differences [Member]    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 371 262
Gross, deferred tax liabilities, beginning balance (23) (14)
Net, deferred tax liability (asset), beginning balance 348 248
(Charged)/credited to income 10 111
Credited/(charged) to equity 0 0
Credited to other comprehensive income 0 0
Impact of business combinations   0
Other movements   (11)
Gross deferred tax assets, ending balance 381 371
Gross, deferred tax liabilities, ending balance (23) (23)
Net, deferred tax liability (asset), ending balance 358 348
Tax Loss Carry-forwards Related Temporary Differences [Member]    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 110 39
Gross, deferred tax liabilities, beginning balance 0 0
Net, deferred tax liability (asset), beginning balance 110 39
(Charged)/credited to income 59 50
Credited/(charged) to equity 5 0
Credited to other comprehensive income 0 0
Impact of business combinations   28
Other movements   (7)
Gross deferred tax assets, ending balance 174 110
Gross, deferred tax liabilities, ending balance 0 0
Net, deferred tax liability (asset), ending balance 174 110
Other Assets, Provisions, And Accruals Related Temporary Differences [Member]    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Gross deferred tax assets, beginning balance 281 235
Gross, deferred tax liabilities, beginning balance (46) (18)
Net, deferred tax liability (asset), beginning balance 235 217
(Charged)/credited to income 26 (36)
Credited/(charged) to equity (16) 25
Credited to other comprehensive income 3 5
Impact of business combinations   0
Other movements   24
Gross deferred tax assets, ending balance 314 281
Gross, deferred tax liabilities, ending balance (66) (46)
Net, deferred tax liability (asset), ending balance $ 248 $ 235