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Earnings per Share - Summary of Calculations of Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Earnings per share [abstract] |  |  |
Weighted-average number of shares outstanding | 44,125,288 | 45,393,602 | 45,569,180
Effect of dilutive instruments – mandatorily convertible securities (note 17.2) |  |  | 708,153
Weighted-average number of shares — basic | 44,125,288 | 45,393,602 | 46,277,333
Effect of dilutive instruments — share-based compensation (note 22) | 745,163 | 470,985 | 316,970
Effect of potentially dilutive instruments — optionally convertible securities (note 17.2) |  | 1,457,554 | 1,420,437
Weighted-average number of shares — diluted | 44,870,451 | 47,322,141 | 48,014,740
Net income (loss) from continuing operations | $ (1,326) | $ 91 | $ 493
Less: non-controlling interest net income (loss) | 21 | 36 | 42
Controlling interest net income (loss) from continuing operations | (1,347) | 55 | 451
Plus: after tax interest expense on mandatorily convertible securities |  | 1 | 3
Controlling interest net income from (loss) continuing operations - for basic earnings per share calculations | (1,347) | 56 | 454
Plus: after tax interest expense on optionally convertible securities | 4 | 18 | 23
Controlling interest net income from (loss) continuing operations - for diluted earnings per share calculations | (1,343) | 74 | 477
Net income from (loss) discontinued operations | $ (120) | $ 88 | $ 77
Basic earnings per share |  |  |
Controlling interest basic earnings (loss) per share | $ (0.0332) | $ 0.0031 | $ 0.0114
Controlling interest basic earnings (loss) per share from continuing operations | (0.0305) | 0.0012 | 0.0098
Controlling interest basic earnings (loss) per share from discontinued operations | (0.0027) | 0.0019 | 0.0016
Diluted earnings per share |  |  |
Controlling interest diluted earnings (loss) per share | (0.0332) | 0.0031 | 0.0114
Controlling interest diluted earnings (loss) per share from continuing operations | (0.0305) | 0.0012 | 0.0098
Controlling interest diluted (loss) earnings per share from discontinued operations | $ (0.0027) | $ 0.0019 | $ 0.0016

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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 2020-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2020-en-r&anchor=para_70_b&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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