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Segmental Information - Summary of Geographical Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of geographical areas [line items] |  |  |
System Fund | $ 1,233 | $ 1,242 | $ 1,199
Revenue | 4,337 | 4,075 | 3,912
Non-current assets | 2,019 | 1,825 |
Before system funds [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 3,104 | 2,833 | 2,713
United Kingdom [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 151 | 74 | 72
Non-current assets | 148 | 52 |
United States [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 1,950 | 1,845 | 1,750
Non-current assets | 1,510 | 1,476 |
China [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 222 | 201 | 192
Rest of world [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 781 | 713 | $ 699
Non-current assets | $ 361 | $ 297 |

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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. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 113 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_113_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 114 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_114&doctype=Standard -URIDate 2018-03-16 + Details
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