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Equity - Summary of Equity Share Capital (Detail) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of classes of share capital [line items] |  |  |
Number of shares beginning balance | 197 | 197 | 206
Beginning balance | $ (1,131) | $ (1,354) | $ (1,191)
Share capital consolidation | (10) |  | (9)
Number of shares ending balance | 187 | 197 | 197
Ending balance | $ (1,465) | $ (1,131) | $ (1,354)
Equity share capital [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Beginning balance | 146 | 154 | 141
Exchange adjustments | 5 | (8) | 13
Ending balance | 151 | 146 | 154
Share premium [Member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Beginning balance | 96 | 101 | 93
Exchange adjustments | 3 | (5) | 8
Ending balance | 99 | 96 | 101
Nominal value [Member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Beginning balance | 50 | 53 | 48
Exchange adjustments | 2 | (3) | 5
Ending balance | $ 52 | $ 50 | $ 53

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