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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, 2018 | Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax liabilities | $ 5,435 | $ 6,440
Deferred tax assets | (4,899) | (6,207)
Charged/(credited) to the income statement | 516 | 695
Capital allowances [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax liabilities | 4,408 | 5,208
Deferred tax assets | (154) | (579)
Charged/(credited) to the income statement | 461 | 278
Unremitted earnings [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax liabilities | 454 | 588
Capitalised interest [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax liabilities | 259 | 391
Unrealised exchange gains (losses) [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax liabilities | 5 | 31
Deferred tax assets | (187) | (317)
Charged/(credited) to the income statement | 57 | 36
Other temporary differences [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax liabilities | 309 | 222
Deferred tax assets | (786) | (682)
Charged/(credited) to the income statement | 50 | (235)
Tax losses [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax assets | (1,894) | (2,282)
Charged/(credited) to the income statement | (30) | 12
Provisions [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax assets | (1,585) | (1,731)
Charged/(credited) to the income statement | (19) | 451
Post-retirement benefits [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deferred tax assets | (293) | (616)
Charged/(credited) to the income statement | 30 | 149
Tax on unremitted earnings [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Charged/(credited) to the income statement | $ (33) | $ 4

X
- 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 2017-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_ii&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2017-03-09 + Details
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