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Financial risk management and derivative financial instruments - Summary of Undiscounted Contractual Cash Flows of Financial Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Non-derivative financial liabilities: |  |
Lease liabilities | $ 3,857 | $ 3,891
Currency swaps hedging EUR500m 2.125% bonds 2027 outflows [member] |  |
Derivative financial liabilities: |  |
Currency swaps hedging €500m 2.125% bonds 2027 inflows | 728 | 723
Currency swaps hedging EUR500m 2.125% bonds 2027 inflows [member] |  |
Derivative financial liabilities: |  |
Currency swaps hedging €500m 2.125% bonds 2027 inflows | (657) | (676)
Forward contract [member] |  |
Derivative financial liabilities: |  |
Currency swaps hedging €500m 2.125% bonds 2027 inflows | (1) | (1)
Deferred and contingent purchase consideration [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 162 | 314
Bank Overdrafts [member] |  |
Non-derivative financial liabilities: |  |
Borrowings | 87 | 104
GBP400m 3.875% bonds 2022 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 590 | 590
GBP300m 3.75% bonds 2025 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 486 | 483
GBP350m 2.125% bonds 2026 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 531 | 523
EUR500m 2.125% bonds 2027 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 657 | 676
Unsecured bank loans [member] |  |
Non-derivative financial liabilities: |  |
Borrowings | 125 |
Trade Payables [Member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 570 | 610
Due within one year [member] |  |
Non-derivative financial liabilities: |  |
Lease liabilities | 97 | 93
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 | 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 | (12) | (6)
Due within one year [member] | Forward contract [member] |  |
Derivative financial liabilities: |  |
Currency swaps hedging €500m 2.125% bonds 2027 inflows | (1) | (1)
Due within one year [member] | Deferred and contingent purchase consideration [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 3 | 7
Due within one year [member] | Bank Overdrafts [member] |  |
Non-derivative financial liabilities: |  |
Borrowings | 87 | 104
Due within one year [member] | GBP400m 3.875% bonds 2022 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 21 | 20
Due within one year [member] | GBP300m 3.75% bonds 2025 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 15 | 14
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 | 12 | 6
Due within one year [member] | Unsecured bank loans [member] |  |
Non-derivative financial liabilities: |  |
Borrowings | 125 |
Due within one year [member] | Trade Payables [Member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 567 | 609
Between 1 and 2 years [member] |  |
Non-derivative financial liabilities: |  |
Lease liabilities | 116 | 93
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 | 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) | (12)
Between 1 and 2 years [member] | Deferred and contingent purchase consideration [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 20 | 8
Between 1 and 2 years [member] | GBP400m 3.875% bonds 2022 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 21 | 20
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 | 10
Between 1 and 2 years [member] | EUR500m 2.125% bonds 2027 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 12 | 12
Between 1 and 2 years [member] | Trade Payables [Member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 1 |
After two but before five years [member] |  |
Non-derivative financial liabilities: |  |
Lease liabilities | 193 | 226
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 | 61 | 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 | (36) | (37)
After two but before five years [member] | Deferred and contingent purchase consideration [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 19 | 37
After two but before five years [member] | GBP400m 3.875% bonds 2022 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 548 | 550
After two but before five years [member] | GBP300m 3.75% bonds 2025 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 45 | 43
After two but before five years [member] | GBP350m 2.125% bonds 2026 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 29 | 28
After two but before five years [member] | EUR500m 2.125% bonds 2027 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 36 | 37
After two but before five years [member] | Trade Payables [Member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 1 | 1
More than 5 years [member] |  |
Non-derivative financial liabilities: |  |
Lease liabilities | 3,451 | 3,479
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 | 627 | 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 | (597) | (621)
More than 5 years [member] | Deferred and contingent purchase consideration [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 120 | 262
More than 5 years [member] | GBP300m 3.75% bonds 2025 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 411 | 412
More than 5 years [member] | GBP350m 2.125% bonds 2026 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 482 | 475
More than 5 years [member] | EUR500m 2.125% bonds 2027 [member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | 597 | $ 621
More than 5 years [member] | Trade Payables [Member] |  |
Non-derivative financial liabilities: |  |
Non-derivative financial liabilities | $ 1 |

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