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Financial risk management and derivatives - Summary of Undiscounted Contractual Cash Flows of Financial Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Non-derivative financial liabilities: |  |
Finance lease obligations | $ 3,300 | $ 3,317
Non-derivative financial liabilities | 645 | 633
Derivative financial liabilities: |  |
Forward foreign exchange contracts | (1) |
Currency swaps hedging EUR500m 2.125% bonds 2027 outflows [member] |  |
Derivative financial liabilities: |  |
Currency swaps hedging €500m 2.125% bonds 2027 inflows | 723 |
Currency swaps hedging EUR500m 2.125% bonds 2027 inflows [member] |  |
Derivative financial liabilities: |  |
Currency swaps hedging €500m 2.125% bonds 2027 inflows | (676) |
Deferred and contingent purchase consideration [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 314 |
Borrowings [member] |  |
Non-derivative financial liabilities: |  |
Borrowings | 104 | 110
GBP400m 3.875% bonds 2022 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 590 | 643
GBP300m 3.75% bonds 2025 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 483 | 521
GBP350m 2.125% bonds 2026 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 523 | 560
EUR500m 2.125% bonds 2027 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 676 |
Unsecured bank loans [member] |  |
Non-derivative financial liabilities: |  |
Borrowings |  | 264
Due within one year [member] |  |
Non-derivative financial liabilities: |  |
Finance lease obligations | 16 | 16
Non-derivative financial liabilities | 611 | 597
Derivative financial liabilities: |  |
Forward foreign exchange contracts | (1) |
Due within one year [member] | Currency swaps hedging EUR500m 2.125% bonds 2027 outflows [member] |  |
Derivative financial liabilities: |  |
Currency swaps hedging €500m 2.125% bonds 2027 inflows | 20 |
Due within one year [member] | Currency swaps hedging EUR500m 2.125% bonds 2027 inflows [member] |  |
Derivative financial liabilities: |  |
Currency swaps hedging €500m 2.125% bonds 2027 inflows | (6) |
Due within one year [member] | Deferred and contingent purchase consideration [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 7 |
Due within one year [member] | Borrowings [member] |  |
Non-derivative financial liabilities: |  |
Borrowings | 104 | 110
Due within one year [member] | GBP400m 3.875% bonds 2022 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 20 | 21
Due within one year [member] | GBP300m 3.75% bonds 2025 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 14 | 15
Due within one year [member] | GBP350m 2.125% bonds 2026 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 10 | 10
Due within one year [member] | EUR500m 2.125% bonds 2027 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 6 |
Due within one year [member] | Unsecured bank loans [member] |  |
Non-derivative financial liabilities: |  |
Borrowings |  | 264
Between 1 and 2 years [member] |  |
Non-derivative financial liabilities: |  |
Finance lease obligations | 16 | 16
Non-derivative financial liabilities | 5 | 5
Derivative financial liabilities: |  |
Forward foreign exchange contracts | 0 |
Between 1 and 2 years [member] | Currency swaps hedging EUR500m 2.125% bonds 2027 outflows [member] |  |
Derivative financial liabilities: |  |
Currency swaps hedging €500m 2.125% bonds 2027 inflows | 20 |
Between 1 and 2 years [member] | Currency swaps hedging EUR500m 2.125% bonds 2027 inflows [member] |  |
Derivative financial liabilities: |  |
Currency swaps hedging €500m 2.125% bonds 2027 inflows | (12) |
Between 1 and 2 years [member] | Deferred and contingent purchase consideration [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 8 |
Between 1 and 2 years [member] | Borrowings [member] |  |
Non-derivative financial liabilities: |  |
Borrowings | 0 |
Between 1 and 2 years [member] | GBP400m 3.875% bonds 2022 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 20 | 21
Between 1 and 2 years [member] | GBP300m 3.75% bonds 2025 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 14 | 15
Between 1 and 2 years [member] | GBP350m 2.125% bonds 2026 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 10 | 10
Between 1 and 2 years [member] | EUR500m 2.125% bonds 2027 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 12 |
After two but before five years [member] |  |
Non-derivative financial liabilities: |  |
Finance lease obligations | 56 | 51
Non-derivative financial liabilities | 9 | 11
Derivative financial liabilities: |  |
Forward foreign exchange contracts | 0 |
After two but before five years [member] | Currency swaps hedging EUR500m 2.125% bonds 2027 outflows [member] |  |
Derivative financial liabilities: |  |
Currency swaps hedging €500m 2.125% bonds 2027 inflows | 58 |
After two but before five years [member] | Currency swaps hedging EUR500m 2.125% bonds 2027 inflows [member] |  |
Derivative financial liabilities: |  |
Currency swaps hedging €500m 2.125% bonds 2027 inflows | (37) |
After two but before five years [member] | Deferred and contingent purchase consideration [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 37 |
After two but before five years [member] | Borrowings [member] |  |
Non-derivative financial liabilities: |  |
Borrowings | 0 |
After two but before five years [member] | GBP400m 3.875% bonds 2022 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 550 | 601
After two but before five years [member] | GBP300m 3.75% bonds 2025 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 43 | 46
After two but before five years [member] | GBP350m 2.125% bonds 2026 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 28 | 30
After two but before five years [member] | EUR500m 2.125% bonds 2027 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 37 |
More than 5 years [member] |  |
Non-derivative financial liabilities: |  |
Finance lease obligations | 3,212 | 3,234
Non-derivative financial liabilities | 20 | 20
Derivative financial liabilities: |  |
Forward foreign exchange contracts | 0 |
More than 5 years [member] | Currency swaps hedging EUR500m 2.125% bonds 2027 outflows [member] |  |
Derivative financial liabilities: |  |
Currency swaps hedging €500m 2.125% bonds 2027 inflows | 625 |
More than 5 years [member] | Currency swaps hedging EUR500m 2.125% bonds 2027 inflows [member] |  |
Derivative financial liabilities: |  |
Currency swaps hedging €500m 2.125% bonds 2027 inflows | (621) |
More than 5 years [member] | Deferred and contingent purchase consideration [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 262 |
More than 5 years [member] | Borrowings [member] |  |
Non-derivative financial liabilities: |  |
Borrowings | 0 |
More than 5 years [member] | GBP400m 3.875% bonds 2022 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 0 |
More than 5 years [member] | GBP300m 3.75% bonds 2025 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 412 | 445
More than 5 years [member] | GBP350m 2.125% bonds 2026 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 475 | $ 510
More than 5 years [member] | EUR500m 2.125% bonds 2027 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | $ 621 |

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