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Segmental Information - Summary of Geographical Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of geographical areas [line items] |  |  |
System Fund | $ 1,373 | $ 1,233 | $ 1,242
Revenue | 4,627 | 4,337 | 4,075
Non-current assets | 2,663 | 2,358 |
Before system funds [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 3,254 | 3,104 | 2,833
United Kingdom [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 265 | 151 | 74
Non-current assets | 184 | 205 |
United States [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 1,957 | 1,950 | 1,845
Non-current assets | 1,632 | 1,643 |
China [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 214 | 222 | 201
Rest of world [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 818 | 781 | $ 713
Non-current assets | $ 847 | $ 510 |

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