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Trade and other receivables - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items] |  |  |
Non-interest-bearing trade receivables, payment terms |  | 30 days |
Impairment Loss On Trade Receivables |  | $ 40 | $ 8
Other receivables |  | 129 | 37
Trade deposits and loans [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Impairment Loss On Trade Receivables |  | 48 |
UK Portfolio [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Rent payable |  | 65 |
Other receivables |  | 77 |
Covid-19 [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Impairment Loss On Trade Receivables | $ 22 | 40 |
System Fund Expenses [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Impairment loss |  | $ 24 | $ 12

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