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(Loss)/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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Basic earnings per ordinary share |  |  |
(Loss)/profit available for equity holders | $ (260) | $ 385 | $ 349
Basic weighted average number of ordinary shares (millions) | 182 | 183 | 190
Basic earnings per ordinary share | $ (1.429) | $ 2.104 | $ 1.837
Diluted earnings per ordinary share |  |  |
(Loss)/profit available for equity holders | $ (260) | $ 385 | $ 349
Diluted weighted average number of ordinary shares (millions) | 182 | 184 | 192
Diluted earnings per ordinary share | $ (1.429) | $ 2.092 | $ 1.818
Adjusted earnings per ordinary share |  |  |
(Loss)/profit available for equity holders | $ (260) | $ 385 | $ 349
Adjusting items: |  |  |
System Fund revenues and expenses | 102 | 49 | 146
Interest attributable to the System Fund | (4) | (18) | (19)
Operating exceptional items before tax | 270 | 186 | 104
Change in fair value of contingent purchase consideration | (13) | (27) | 4
Tax on exceptional items | (52) | (20) | (22)
Exceptional tax |  |  | (5)
Adjusted earnings | 57 | $ 555 | $ 557
Exceptional financial expenses | $ 14 |  |
Basic weighted average number of ordinary shares (millions) | 182 | 183 | 190
Adjusted earnings per ordinary share | $ 0.313 | $ 3.033 | $ 2.932
Adjusted diluted earnings per ordinary share |  |  |
Adjusted earnings | $ 57 | $ 555 | $ 557
Diluted weighted average number of ordinary shares (millions) | 182 | 184 | 192
Adjusted diluted earnings per ordinary share | $ 0.313 | $ 3.016 | $ 2.901
Diluted weighted average number of ordinary shares is calculated as: |  |  |
Basic weighted average number of ordinary shares | 182 | 183 | 190
Dilutive potential ordinary shares |  | 1 | 2
Adjusted weighted average shares | 182 | 184 | 192

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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 2020-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2020-en-r&anchor=para_66&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2020-en-r&anchor=para_66&doctype=Standard -URIDate 2020-01-01 + Details
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