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Deferred tax assets and liabilities - Activity in deferred tax asset (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Gross deferred tax assets, beginning balance | $ 673 | $ 550
Gross, deferred tax liabilities, beginning balance | (1,531) | (1,664)
Net, deferred tax liability (asset), beginning balance | (858) | (1,114)
Credited/(charged) to income | (122) | 307
Credited (charged) to equity | 25 | (2)
Charged to other comprehensive income | 16 | (2)
Impact of business combinations | (93) | (66)
Other movements | 0 | 19
Gross deferred tax assets, ending balance | 932 | 673
Gross, deferred tax liabilities, ending balance | (1,964) | (1,531)
Net, deferred tax liability (asset), ending balance | (1,032) | (858)
Property, plant & equipment |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Gross deferred tax assets, beginning balance | 12 | 10
Gross, deferred tax liabilities, beginning balance | (94) | (69)
Net, deferred tax liability (asset), beginning balance | (82) | (59)
Credited/(charged) to income | (71) | (23)
Other movements | (6) |
Gross deferred tax assets, ending balance | 13 | 12
Gross, deferred tax liabilities, ending balance | (172) | (94)
Net, deferred tax liability (asset), ending balance | (159) | (82)
Intangible assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Gross deferred tax assets, beginning balance |  |
Gross, deferred tax liabilities, beginning balance | (1,403) | (1,531)
Net, deferred tax liability (asset), beginning balance | (1,403) | (1,531)
Credited/(charged) to income | (194) | 212
Impact of business combinations | (121) | (78)
Other movements | 11 | (6)
Gross deferred tax assets, ending balance | 6 |
Gross, deferred tax liabilities, ending balance | (1,713) | (1,403)
Net, deferred tax liability (asset), ending balance | (1,707) | (1,403)
Pensions and other benefit obligations of associates |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Gross deferred tax assets, beginning balance | 125 | 121
Gross, deferred tax liabilities, beginning balance | (2) | (7)
Net, deferred tax liability (asset), beginning balance | 123 | 114
Credited/(charged) to income | 18 | 13
Charged to other comprehensive income | 11 | (2)
Other movements | (11) | (2)
Gross deferred tax assets, ending balance | 151 | 125
Gross, deferred tax liabilities, ending balance | (10) | (2)
Net, deferred tax liability (asset), ending balance | 141 | 123
Inventories |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Gross deferred tax assets, beginning balance | 262 | 169
Gross, deferred tax liabilities, beginning balance | (14) | (32)
Net, deferred tax liability (asset), beginning balance | 248 | 137
Credited/(charged) to income | 111 | 82
Other movements | (11) | 29
Gross deferred tax assets, ending balance | 371 | 262
Gross, deferred tax liabilities, ending balance | (23) | (14)
Net, deferred tax liability (asset), ending balance | 348 | 248
Tax loss carry- forwards |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Gross deferred tax assets, beginning balance | 39 | 18
Gross, deferred tax liabilities, beginning balance |  |
Net, deferred tax liability (asset), beginning balance | 39 | 18
Credited/(charged) to income | 50 | 9
Impact of business combinations | 28 | 12
Other movements | (7) |
Gross deferred tax assets, ending balance | 110 | 39
Gross, deferred tax liabilities, ending balance | 0 |
Net, deferred tax liability (asset), ending balance | 110 | 39
Other assets, provisions and accruals |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Gross deferred tax assets, beginning balance | 235 | 232
Gross, deferred tax liabilities, beginning balance | (18) | (25)
Net, deferred tax liability (asset), beginning balance | 217 | 207
Credited/(charged) to income | (36) | 14
Credited (charged) to equity | 25 | (2)
Charged to other comprehensive income | 5 |
Other movements | 24 | (2)
Gross deferred tax assets, ending balance | 281 | 235
Gross, deferred tax liabilities, ending balance | (46) | (18)
Net, deferred tax liability (asset), ending balance | $ 235 | $ 217

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_o&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_56&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_o&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_56&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 81 -Subparagraph ab -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_ab&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 90 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_90&doctype=Standard -URIDate 2019-03-27 + Details
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