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Earnings per ordinary share - Summary of Earnings Per Ordinary Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Basic earnings per ordinary share |  |  |
Profit available for equity holders | $ 592 | $ 414 | $ 1,222
Basic weighted average number of ordinary shares (millions) | 193 | 212 | 235
Basic earnings per ordinary share | $ 306.7 | $ 195.3 | $ 520.0
Diluted earnings per ordinary share |  |  |
Profit available for equity holders | $ 592 | $ 414 | $ 1,222
Diluted weighted average number of ordinary shares (millions) | 194 | 214 | 238
Diluted earnings per ordinary share | $ 305.2 | $ 193.5 | $ 513.4
Adjusted earnings per ordinary share |  |  |
Profit available for equity holders | $ 592 | $ 414 | $ 1,222
Adjusting items (note 5): |  |  |
Exceptional items before tax | (4) | 29 | (819)
Tax on exceptional items | 2 | (12) | 8
Exceptional tax | (118) |  |
Adjusted earnings | $ 472 | $ 431 | $ 411
Basic weighted average number of ordinary shares (millions) | 193 | 212 | 235
Adjusted earnings per ordinary share | $ 2.446 | $ 2.033 | $ 1.749
Adjusted earnings | $ 472 | $ 431 | $ 411
Diluted weighted average number of ordinary shares (millions) | 194 | 214 | 238
Adjusted diluted earnings per ordinary share | $ 2.433 | $ 2.014 | $ 1.727
Diluted weighted average number of ordinary shares is calculated as: |  |  |
Basic weighted average number of ordinary shares | 193 | 212 | 235
Dilutive potential ordinary shares | 1 | 2 | 3
Adjusted weighted average shares | 194 | 214 | 238

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- Definition The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_70_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_66&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_66&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_70_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The profit (loss) attributable to ordinary equity holders of the parent equity, adjusted for the effects of all dilutive potential ordinary shares. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 70 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_70_a&doctype=Standard -URIDate 2017-03-09 + Details
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