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Segmental information - Summary of Geographical Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of geographical areas [line items] |  |  |
Revenue | $ 1,784 | $ 1,715 | $ 1,803
Non-current assets | 2,033 | 1,830 |
United Kingdom [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 68 | 66 | 67
Non-current assets | 108 | 105 |
United States [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 948 | 923 | 876
Non-current assets | 1,511 | 1,343 |
China [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 141 | 133 | 223
Rest of world [member] |  |  |
Disclosure of geographical areas [line items] |  |  |
Revenue | 627 | 593 | $ 637
Non-current assets | $ 414 | $ 382 |

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