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Significant Accounting Policies - Impact of IFRS 16 on Group Statement of Comprehensive Income (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of impact of initial application of new accounting standards [line item] |  |  |
Profit for the year | $ 386 | $ 350 | $ 535
Exchange gains/(losses) on retranslation of foreign operations, including related tax credit of $2m (2017: net of related tax credit of $1m) | (39) | 44 | (90)
Total comprehensive income for the year | $ 349 | 384 | 398
Previously reported [member] |  |  |
Disclosure of impact of initial application of new accounting standards [line item] |  |  |
Profit for the year |  | 352 | 541
Exchange gains/(losses) on retranslation of foreign operations, including related tax credit of $2m (2017: net of related tax credit of $1m) |  | 43 | (88)
Other items |  | (10) | (47)
Total comprehensive income for the year |  | 385 | 406
Increase (decrease) due to application of IFRS 16 [member] |  |  |
Disclosure of impact of initial application of new accounting standards [line item] |  |  |
Profit for the year |  | (2) | (6)
Exchange gains/(losses) on retranslation of foreign operations, including related tax credit of $2m (2017: net of related tax credit of $1m) |  | 1 | (2)
Total comprehensive income for the year |  | (1) | (8)
Restated [member] |  |  |
Disclosure of impact of initial application of new accounting standards [line item] |  |  |
Profit for the year |  | 350 | 535
Exchange gains/(losses) on retranslation of foreign operations, including related tax credit of $2m (2017: net of related tax credit of $1m) |  | 44 | (90)
Other items |  | (10) | (47)
Total comprehensive income for the year |  | $ 384 | $ 398

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