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Segmental Information - Summary of Geographical Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of geographical areas [line items] |  |  |
System Fund | $ 765 | $ 1,373 | $ 1,233
Revenue | 2,394 | 4,627 | 4,337
Non-current assets | 2,259 | 2,663 |
Before system funds [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 1,629 | 3,254 | 3,104
United Kingdom [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 77 | 265 | 151
Non-current assets | 72 | 184 |
United States [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 1,067 | 1,957 | 1,950
Non-current assets | 1,487 | 1,632 |
Rest of world [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 485 | 1,032 | $ 1,003
Non-current assets | $ 700 | $ 847 |

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- Definition The amount of non-current assets other than financial instruments, deferred tax assets, post-employment benefit assets and rights arising under insurance contracts. [Refer: Deferred tax assets; Financial instruments, class [member]; Non-current assets; Types of insurance contracts [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 33 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_33_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 113 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_113_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 114 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_114&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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- Details
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- Details
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