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Loans and other borrowings - Summary of Loans and Other Borrowings (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |
Current | $ 126 | $ 106
Non-current | 1,893 | 1,606
Total | 2,019 | 1,712
Unsecured bank loans [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-current | 262 | 107
Total | 262 | 107
Finance lease obligations [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Current | 16 | 17
Non-current | 215 | 210
Total | 231 | 227
GBP400m 3.875% bonds 2022 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-current | 538 | 489
Total | 538 | 489
GBP300m 3.75% bonds 2025 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-current | 406 | 370
Total | 406 | 370
GBP350m 2.125% bonds 2026 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-current | 472 | 430
Total | 472 | 430
Unsecured bank loans, finance lease obligations, and bonds [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Current | 16 | 17
Non-current | 1,893 | 1,606
Total | 1,909 | 1,623
Bank overdrafts [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Current | 110 | 89
Total | 110 | 89
Sterling [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Non-current | 1,416 | 1,289
Total | 1,416 | 1,289
US dollars [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Current | 124 | 101
Non-current | 477 | 317
Total | 601 | 418
Euros [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Current | 2 | 2
Total | $ 2 | 2
Other currencies [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Current |  | 3
Total |  | $ 3

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