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General Information - Impact of IFRS 15 on Group Statement of Comprehensive Income (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of impact of initial application of new accounting standards [line item] |  |  |
Profit for the year | $ 352 | $ 541 | $ 459
Exchange losses on retranslation of foreign operations, net of related tax credit of $1m | 43 | (88) | 190
Other items |  | (47) |
Total comprehensive income for the year | $ 385 | 406 | $ 647
Previously reported [member] |  |  |
Disclosure of impact of initial application of new accounting standards [line item] |  |  |
Profit for the year |  | 593 |
Exchange losses on retranslation of foreign operations, net of related tax credit of $1m |  | (77) |
Other items |  | (47) |
Total comprehensive income for the year |  | 469 |
Increase (decrease) due to application of IFRS 15 [member] |  |  |
Disclosure of impact of initial application of new accounting standards [line item] |  |  |
Profit for the year |  | (52) |
Exchange losses on retranslation of foreign operations, net of related tax credit of $1m |  | (11) |
Total comprehensive income for the year |  | $ (63) |

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