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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, 2020 | Dec. 31, 2019
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | $ 2,778 | $ 2,573
Cash flows | 1,354 | 68
Exchange adjustment | 213 | 33
Acquisition of businesses |  | 25
Disposal | (19) |
Other | (143) | 79
Ending balance | 4,183 | 2,778
Lease liabilities [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 680 | 670
Cash flows | (65) | (59)
Exchange adjustment | (2) | 1
Acquisition of businesses |  | 25
Disposal | (19) |
Other | (144) | 43
Ending balance | 450 | 680
Currency swaps [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 20 | (7)
Other |  | 27
Ending balance |  | 20
Unsecured bank loans [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 125 |
Cash flows | (125) | 127
Exchange adjustment |  | (2)
Ending balance |  | 125
GBP173m 3.875% bonds 2022 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 528 |
Cash flows | (290) |
Other | (3) |
Ending balance | 235 | 528
EUR500m 1.625% bonds 2024 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Cash flows | 585 |
Exchange adjustment | 26 |
Ending balance | 611 |
GBP400m 3.875% bonds 2022 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 528 | 509
Exchange adjustment |  | 18
Other |  | 1
Ending balance |  | 528
GBP300m 3.75% bonds 2025 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 399 | 385
Exchange adjustment | 13 | 13
Other | 1 | 1
Ending balance | 413 | 399
GBP350m 2.125% bonds 2026 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 462 | 447
Exchange adjustment | 16 | 15
Other | 1 |
Ending balance | 479 | 462
EUR500m 2.125% bonds 2027 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 564 | 569
Exchange adjustment | 53 | (12)
Other | 1 | 7
Ending balance | 618 | 564
GBP400m 3.375% bonds 2028 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Cash flows | 511 |
Exchange adjustment | 29 |
Other | 2 |
Ending balance | 542 |
Commercial paper [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Cash flows | 738 |
Exchange adjustment | 78 |
Other | 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 | 2,758 | 2,580
Cash flows | 1,354 | 68
Exchange adjustment | 213 | 33
Acquisition of businesses |  | 25
Disposal | (19) |
Other | (140) | 52
Ending balance | 4,166 | 2,758
Exchange of principal [member] | Currency swaps [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 20 |
Cash flows | (3) |
Ending balance | 17 | 20
Initial fee received [member] | Currency swaps [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 0 |
Cash flows | 3 |
Other | $ (3) |
Ending balance |  | $ 0

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