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Other Financial Assets - Additional Information (Detail) £ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2021 GBP (£)
Disclosure of financial assets [line items] |  |  |
Other financial assets | $ 175 | $ 169 |
Cash flows from (used in) decrease (increase) in restricted cash and cash equivalents | 3 | 16 |
Debt Instrument Face Amount | 4 |  |
Utilisation, Allowance account for credit losses of financial assets | 8 | 7 |
Acquired Asset [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Utilisation, Allowance account for credit losses of financial assets | 4 |  |
Assets other than cash or cash equivalents in subsidiary or businesses acquired or disposed | 0 |  |
Other Financial Asset [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Other financial assets | 61 | $ 66 |
Trade deposits and loans [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Proceeds From Restricted Deposits | $ 6 |  |
United Kingdom [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Bank accounts pledged as security | £ |  |  | £ 31

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