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Net Debt - Summary of Loans and Other Borrowings and Currency Swaps, Excluding Bank Overdrafts (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | $ 4,183 | $ 2,778
Cash flows | (860) | 1,354
Exchange adjustment | (107) | 213
Acquisition of businesses |  | (19)
Disposal | (3) |
Other | 54 | (143)
Ending balance | 3,267 | 4,183
Lease liabilities [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 450 | 680
Cash flows | (32) | (65)
Exchange adjustment | (3) | (2)
Acquisition of businesses |  | (19)
Disposal | (3) |
Other | 7 | (144)
Ending balance | 419 | 450
Currency swaps [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 17 |
Other | 45 |
Ending balance | 62 | 17
Unsecured bank loans [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance |  | 125
Cash flows |  | (125)
GBP173m 3.875% bonds 2022 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 235 | 528
Cash flows |  | (290)
Exchange adjustment | (3) |
Other | 1 | (3)
Ending balance | 233 | 235
EUR500m 1.625% bonds 2024 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 611 |
Cash flows |  | 585
Exchange adjustment | (48) | 26
Other | 2 |
Ending balance | 565 | 611
GBP300m 3.75% bonds 2025 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 413 | 399
Exchange adjustment | (5) | 13
Other | 0 | 1
Ending balance | 408 | 413
GBP350m 2.125% bonds 2026 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 479 | 462
Exchange adjustment | (6) | 16
Other | 0 | 1
Ending balance | 473 | 479
EUR500m 2.125% bonds 2027 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 618 | 564
Exchange adjustment | (48) | 53
Other | 0 | 1
Ending balance | 570 | 618
GBP400m 3.375% bonds 2028 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 542 |
Cash flows |  | 511
Exchange adjustment | (7) | 29
Other | 2 | 2
Ending balance | 537 | 542
Commercial paper [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 818 |
Cash flows | (828) | 738
Exchange adjustment | 13 | 78
Other | (3) | 2
Ending balance |  | 818
Loans and other borrowings before currency swaps (excluding bank overdrafts) [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 4,166 | 2,758
Cash flows | (860) | 1,354
Exchange adjustment | (107) | 213
Acquisition of businesses |  | (19)
Disposal | (3) |
Other | 9 | (140)
Ending balance | 3,205 | 4,166
Exchange of principal [member] | Currency swaps [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | $ 17 | 20
Cash flows |  | (3)
Ending balance |  | 17
Initial fee received [member] | Currency swaps [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Cash flows |  | 3
Other |  | $ (3)

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