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Other Financial Assets - Schedule of Other Financial Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Disclosure of financial assets [line items] |  |  |
Current |  | $ 0 | $ 2
Non-current |  | 156 | 173
Other financial assets |  | 156 | 175
Equity securities [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets |  | 103 | 106
Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets |  | 45 | 61
Shortfall reserve deposit [member] | Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets |  | 0 | 6
Ring fenced amounts to satisfy insurance claims, Cash [member] | Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | [1] | 2 | 4
Ring fenced amounts to satisfy insurance claims, Money market funds [member] | Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets |  | 3 | 8
Bank accounts pledged as security [member] | Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets |  | 39 | 42
Other [member] | Restricted funds [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets |  | 1 | 1
Trade and other receivables [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets |  | $ 8 | $ 8
[1] | As described on page 168, amounts within these lines have been re-presented as cash and cash equivalents.

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