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Other Financial Assets - Schedule of Other Financial Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of financial assets [line items] |  |
Current | $ 2 | $ 1
Non-current | 173 | 168
Other financial assets | 175 | 169
Equity securities [member] |  |
Disclosure of financial assets [line items] |  |
Other financial assets | 106 | 88
Restricted funds [member] |  |
Disclosure of financial assets [line items] |  |
Other financial assets | 61 | 73
Shortfall reserve deposit [member] | Restricted funds [member] |  |
Disclosure of financial assets [line items] |  |
Other financial assets | 6 | 9
Ring fenced amounts to satisfy insurance claims, Cash [member] | Restricted funds [member] |  |
Disclosure of financial assets [line items] |  |
Other financial assets | 4 | 3
Ring fenced amounts to satisfy insurance claims, Money market funds [member] | Restricted funds [member] |  |
Disclosure of financial assets [line items] |  |
Other financial assets | 8 | 15
Bank accounts pledged as security [member] | Restricted funds [member] |  |
Disclosure of financial assets [line items] |  |
Other financial assets | 42 | 43
Other [member] | Restricted funds [member] |  |
Disclosure of financial assets [line items] |  |
Other financial assets | 1 | 3
Trade and other receivables [member] |  |
Disclosure of financial assets [line items] |  |
Other financial assets | $ 8 | $ 8

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