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Other Financial Assets - Schedule of Other Financial Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |
Current | $ 1 | $ 4 | $ 1
Non-current | 168 | 284 | $ 260
Other financial assets | 169 | 288 |
Equity securities [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | 88 | 133 |
Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | 73 | 98 |
Quoted equity shares [member] | Equity securities [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets |  | 8 |
Shortfall reserve deposit [member] | Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | 9 | 25 |
Ring fenced amounts to satisfy insurance claims, Cash [member] | Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | 3 | 11 |
Ring fenced amounts to satisfy insurance claims, Money market funds [member] | Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | 15 | 16 |
Other [member] | Equity securities [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | 88 | 125 |
Other [member] | Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | 3 | 5 |
Bank accounts pledged as security [member] | Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | 43 | 41 |
Trade and other receivables [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | $ 8 | $ 57 |

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