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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, 2019 | Dec. 31, 2018
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | $ 2,573 | $ 2,311
Cash flows | 68 | 254
Exchange adjustment | 33 | (73)
Acquisition of businesses | 25 | 51
Other | 79 | 30
Ending balance | 2,778 | 2,573
Lease liabilities [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 670 | 633
Cash flows | (59) | (35)
Exchange adjustment | 1 | (6)
Acquisition of businesses | 25 | 51
Other | 43 | 27
Ending balance | 680 | 670
Currency swaps [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | (7) |
Cash flows |  | (2)
Other | 27 | (5)
Ending balance | 20 | (7)
Unsecured bank loans [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance |  | 262
Cash flows | 127 | (268)
Exchange adjustment | (2) | 3
Other | 0 | 3
Ending balance | 125 |
GBP400m 3.875% bonds 2022 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 509 | 538
Exchange adjustment | 18 | (30)
Other | 1 | 1
Ending balance | 528 | 509
GBP300m 3.75% bonds 2025 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 385 | 406
Exchange adjustment | 13 | (23)
Other | 1 | 2
Ending balance | 399 | 385
GBP350m 2.125% bonds 2026 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 447 | 472
Exchange adjustment | 15 | (26)
Other | 0 | 1
Ending balance | 462 | 447
EUR500m 2.125% bonds 2027 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 569 |
Cash flows |  | 559
Exchange adjustment | (12) | 9
Other | 7 | 1
Ending balance | 564 | 569
Loans and other borrowings before currency swaps (excluding bank overdrafts) [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 2,580 | 2,311
Cash flows | 68 | 256
Exchange adjustment | 33 | (73)
Acquisition of businesses | 25 | 51
Other | 52 | 35
Ending balance | 2,758 | 2,580
Exchange of principal [member] | Currency swaps [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | $ (7) |
Cash flows |  | (5)
Other |  | (2)
Ending balance |  | (7)
Initial fee received [member] | Currency swaps [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Cash flows |  | 3
Other |  | $ (3)

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