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Equity - Summary of Equity Share Capital (Detail) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of classes of share capital [line items] |  |  |
Number of shares beginning balance | 187 | 197 | 197
Beginning balance | $ (1,465) | $ (1,131) | $ (1,354)
Share capital consolidation |  | (10) |
Number of shares ending balance | 187 | 187 | 197
Ending balance | $ (1,849) | $ (1,465) | $ (1,131)
Equity share capital [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Beginning balance | 151 | 146 | 154
Exchange adjustments | 5 | 5 | (8)
Ending balance | 156 | 151 | 146
Share premium [Member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Beginning balance | 99 | 96 | 101
Exchange adjustments | 4 | 3 | (5)
Ending balance | 103 | 99 | 96
Nominal value [Member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Beginning balance | 52 | 50 | 53
Exchange adjustments | 1 | 2 | (3)
Ending balance | $ 53 | $ 52 | $ 50

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