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Equity - Summary of Equity Share Capital (Detail) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of classes of share capital [line items] |  |  |
Number of shares beginning balance | 206 | 248 | 248
Beginning balance | $ (759) | $ 319 | $ (717)
Share capital consolidation | (9) | (42) |
Number of shares ending balance | 197 | 206 | 248
Ending balance | $ (851) | $ (759) | $ 319
Equity share capital [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Beginning balance | 141 | 169 | 178
Exchange adjustments | 13 | (28) | (9)
Ending balance | 154 | 141 | 169
Share premium [Member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Beginning balance | 93 | 111 | 117
Exchange adjustments | 8 | (18) | (6)
Ending balance | 101 | 93 | 111
Nominal value [Member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Beginning balance | 48 | 58 | 61
Exchange adjustments | 5 | (10) | (3)
Ending balance | $ 53 | $ 48 | $ 58

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