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Taxation - Summary of tax relating to components of other comprehensive income or loss (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Relating To Components Of Other Comprehensive Income That Will Be Reclassified To Profit Or Loss [Abstract] |  |  |
Tax (charge)/credit on actuarial gains and losses on post-retirement benefit plans | $ (12) | $ 29 | $ (175)
Adjustments to deferred tax on post-retirement benefit plans due to changes in corporate tax rates in the US and France | (140) |  |
Other | (1) | 4 | (3)
Tax relating to components of other comprehensive income/(loss) for the year | $ (153) | $ 33 | $ (178)

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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 2016-01-13 -Paragraph 81 -Subparagraph ab -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2016-03-30&anchor=para_81_ab&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 90 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_90&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2016-01-13 -Paragraph 81 -Subparagraph ab -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2016-03-30&anchor=para_81_ab&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 90 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_90&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition Income tax relating to Adjustments to deferred tax on post-retirement benefit plans due to changes in corporate tax rates in the US and France. + References No definition available. + Details
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- Definition Income tax relating to other component of other comprehensive income. + References No definition available. + Details
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