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Financial risk management - Summary of Undiscounted Contractual Cash Flows of Financial Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Non-derivative financial liabilities: |  |
Finance lease obligations | $ 3,317 | $ 3,333
Trade and other payables, excluding deferred revenue | 1,222 | 1,219
Provisions | 8 | 8
Derivative financial liabilities: |  |
Forward foreign exchange contracts |  | 3
Bank overdrafts [member] |  |
Non-derivative financial liabilities: |  |
Bank loan | 110 | 89
Unsecured bank loans [member] |  |
Non-derivative financial liabilities: |  |
Bank loan | 264 | 110
GBP400m 3.875% bonds 2022 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 643 | 605
GBP300m 3.75% bonds 2025 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 521 | 489
GBP350m 2.125% bonds 2026 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 560 | 519
Less than 1 year [member] |  |
Non-derivative financial liabilities: |  |
Finance lease obligations | 16 | 17
Trade and other payables, excluding deferred revenue | 719 | 644
Provisions | 3 | 3
Derivative financial liabilities: |  |
Forward foreign exchange contracts |  | 3
Less than 1 year [member] | Bank overdrafts [member] |  |
Non-derivative financial liabilities: |  |
Bank loan | 110 | 89
Less than 1 year [member] | Unsecured bank loans [member] |  |
Non-derivative financial liabilities: |  |
Bank loan | 264 | 110
Less than 1 year [member] | GBP400m 3.875% bonds 2022 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 21 | 19
Less than 1 year [member] | GBP300m 3.75% bonds 2025 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 15 | 14
Less than 1 year [member] | GBP350m 2.125% bonds 2026 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 10 | 9
Between 1 and 2 years [member] |  |
Non-derivative financial liabilities: |  |
Finance lease obligations | 16 | 16
Trade and other payables, excluding deferred revenue | 138 | 173
Provisions | 5 | 5
Between 1 and 2 years [member] | GBP400m 3.875% bonds 2022 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 21 | 19
Between 1 and 2 years [member] | GBP300m 3.75% bonds 2025 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 15 | 14
Between 1 and 2 years [member] | GBP350m 2.125% bonds 2026 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 10 | 9
Between 2 and 5 years [Member] |  |
Non-derivative financial liabilities: |  |
Finance lease obligations | 51 | 48
Trade and other payables, excluding deferred revenue | 189 | 210
Between 2 and 5 years [Member] | GBP400m 3.875% bonds 2022 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 601 | 57
Between 2 and 5 years [Member] | GBP300m 3.75% bonds 2025 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 46 | 42
Between 2 and 5 years [Member] | GBP350m 2.125% bonds 2026 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 30 | 28
More than 5 years [member] |  |
Non-derivative financial liabilities: |  |
Finance lease obligations | 3,234 | 3,252
Trade and other payables, excluding deferred revenue | 176 | 192
More than 5 years [member] | GBP400m 3.875% bonds 2022 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities |  | 510
More than 5 years [member] | GBP300m 3.75% bonds 2025 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 445 | 419
More than 5 years [member] | GBP350m 2.125% bonds 2026 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | $ 510 | $ 473

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