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Other Financial Assets - Schedule of Other Financial Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |
Equity securities measured at fair value | $ 116 | $ 127 |
Financial assets measured at amortised cost | 145 | 117 |
Total other financial assets | 261 | 244 |
Current | 1 | 16 | $ 20
Non-current | 260 | 228 | $ 248
Total other financial assets | 261 | 244 |
Quoted equity shares [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Equity securities measured at fair value | 8 | 10 |
Unquoted equity shares [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Equity securities measured at fair value | 108 | 117 |
Trade deposits and loans [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets measured at amortised cost | 50 | 43 |
Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets measured at amortised cost | 55 | 32 |
Bank accounts pledged as security [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets measured at amortised cost | $ 40 | $ 42 |

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