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Other Financial Assets - Schedule of Other Financial Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |
Current | $ 4 | $ 1 | $ 16
Non-current | 284 | 260 | $ 228
Other financial assets | 288 | 261 |
Equity securities [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | 133 | 116 |
Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | 98 | 95 |
Quoted equity shares [member] | Equity securities [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | 8 | 8 |
Unquoted equity shares [member] | Equity securities [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | 125 | 108 |
Shortfall reserve deposit [member] | Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | 25 | 25 |
Ring fenced amounts to satisfy insurance claims, Cash [member] | Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | 11 | 12 |
Ring fenced amounts to satisfy insurance claims, Money market funds [member] | Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | 16 | 16 |
Other [member] | Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | 5 | 2 |
Bank accounts pledged as security [member] | Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | 41 | 40 |
Trade deposits and loans [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | $ 57 | $ 50 |

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