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Deferred Taxation - Deferred tax liabilities and assets, prior to offsetting of balances (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax liabilities | $ 5,832 | $ 5,435
Deferred tax assets | (5,714) | (4,899)
Charged/(credited) to the income statement | (289) | 516
Tax losses [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax assets | (1,847) | (1,894)
Charged/(credited) to the income statement | 164 | (30)
Provisions |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax assets | (1,810) | (1,585)
Charged/(credited) to the income statement | (175) | (19)
Capital allowances |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax liabilities | 4,742 | 4,408
Deferred tax assets | (604) | (154)
Charged/(credited) to the income statement | (181) | 461
Unremitted earnings |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax liabilities | 411 | 454
Capitalised interest |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax liabilities | 387 | 259
Unrealised exchange losses |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax liabilities | 3 | 5
Deferred tax assets | (176) | (187)
Charged/(credited) to the income statement | 21 | 57
Tax on unremitted earnings |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Charged/(credited) to the income statement | 5 | (33)
Post-retirement benefits |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax assets | (346) | (293)
Charged/(credited) to the income statement | 18 | 30
Other temporary differences |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax liabilities | 289 | 309
Deferred tax assets | (931) | (786)
Charged/(credited) to the income statement | $ (141) | $ 50

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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 amount of deferred tax assets net of deferred tax liabilities, when the absolute amount of deferred tax assets is greater than the absolute amount of deferred tax liabilities. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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- Definition The amount of deferred tax liabilities net of deferred tax assets, when the absolute amount of deferred tax liabilities is greater than the absolute amount of deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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