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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Basic earnings per ordinary share |  |  |
Profit available for equity holders | $ 385 | $ 349 | $ 534
Basic weighted average number of ordinary shares (millions) | 183 | 190 | 193
Basic earnings per ordinary share | $ 2.104 | $ 1.837 | $ 2.767
Diluted earnings per ordinary share |  |  |
Profit available for equity holders | $ 385 | $ 349 | $ 534
Diluted weighted average number of ordinary shares (millions) | 184 | 192 | 194
Diluted earnings per ordinary share | $ 2.092 | $ 1.818 | $ 2.753
Adjusted earnings per ordinary share |  |  |
Profit available for equity holders | $ 385 | $ 349 | $ 534
Adjusting items: |  |  |
System Fund revenues and expenses | 49 | 146 | 34
Interest attributable to the System Fund | (18) | (19) | (13)
Tax attributable to the System Fund |  |  | 3
Operating exceptional items before tax | 186 | 104 | (4)
Change in fair value of contingent purchase consideration | (27) | 4 |
Tax on exceptional items | (20) | (22) | 2
Exceptional tax |  | (5) | (87)
Adjusted earnings | $ 555 | $ 557 | $ 469
Basic weighted average number of ordinary shares (millions) | 183 | 190 | 193
Adjusted earnings per ordinary share | $ 3.303 | $ 2.932 | $ 2.430
Adjusted diluted earnings per ordinary share |  |  |
Adjusted earnings | $ 555 | $ 557 | $ 469
Diluted weighted average number of ordinary shares (millions) | 184 | 192 | 194
Adjusted diluted earnings per ordinary share | $ 3.016 | $ 2.901 | $ 2.418
Diluted weighted average number of ordinary shares is calculated as: |  |  |
Basic weighted average number of ordinary shares | 183 | 190 | 193
Dilutive potential ordinary shares | 1 | 2 | 1
Adjusted weighted average shares | 184 | 192 | 194

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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 2019-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_66&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_66&doctype=Standard -URIDate 2019-03-27 + Details
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