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Loans and Other Borrowings - Summary of Loans and Other Borrowings (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |
Current | $ 120 | $ 126 | $ 106
Non-current | 2,129 | 1,893 | $ 1,606
Total | 2,249 | 2,019 |
Unsecured bank loans [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 0 |  |
Non-current | 0 | 262 |
Total | 0 | 262 |
Finance lease obligations [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 16 | 16 |
Non-current | 219 | 215 |
Total | 235 | 231 |
GBP400m 3.875% bonds 2022 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 0 |  |
Non-current | 509 | 538 |
Total | 509 | 538 |
GBP300m 3.75% bonds 2025 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 0 |  |
Non-current | 385 | 406 |
Total | 385 | 406 |
GBP350m 2.125% bonds 2026 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 0 |  |
Non-current | 447 | 472 |
Total | 447 | 472 |
EUR500m 2.125% bonds 2027 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 0 |  |
Non-current | 569 |  |
Total | 569 |  |
Unsecured bank loans, finance lease obligations, and bonds [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 16 | 16 |
Non-current | 2,129 | 1,893 |
Total | 2,145 | 1,909 |
Borrowings [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 104 | 110 |
Non-current | 0 |  |
Total | 104 | 110 |
Sterling [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 0 |  |
Non-current | 1,341 | 1,416 |
Total | 1,341 | 1,416 |
US dollars [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 110 | 124 |
Non-current | 219 | 477 |
Total | 329 | 601 |
Euros [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 8 | 2 |
Non-current | 569 |  |
Total | 577 | $ 2 |
Other currencies [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 2 |  |
Non-current | 0 |  |
Total | $ 2 |  |

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