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Loans and Other Borrowings - Summary of Loans and Other Borrowings and Currency Swaps, Excluding Bank Overdrafts (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | $ 1,909 | $ 1,623
Cash flows | 289 | 153
Exchange adjustment | (67) | 127
Other | 7 | 6
Ending balance | 2,138 | 1,909
Currency swaps [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 0 |
Cash flows | (2) |
Exchange adjustment | 0 |
Other | (5) |
Ending balance | (7) | 0
Unsecured bank loans [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 262 | 107
Cash flows | (268) | 153
Exchange adjustment | 3 | 1
Other | 3 | 1
Ending balance | 0 | 262
Finance lease obligations [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 231 | 227
Cash flows | 0 |
Exchange adjustment | 0 |
Other | 4 | 4
Ending balance | 235 | 231
GBP400m 3.875% bonds 2022 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 538 | 489
Cash flows | 0 |
Exchange adjustment | (30) | 48
Other | 1 | 1
Ending balance | 509 | 538
GBP300m 3.75% bonds 2025 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 406 | 370
Cash flows | 0 |
Exchange adjustment | (23) | 36
Other | 2 |
Ending balance | 385 | 406
GBP350m 2.125% bonds 2026 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 472 | 430
Cash flows | 0 |
Exchange adjustment | (26) | 42
Other | 1 |
Ending balance | 447 | 472
EUR500m 2.125% bonds 2027 [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 0 |
Cash flows | 559 |
Exchange adjustment | 9 |
Other | 1 |
Ending balance | 569 | 0
Loans and other borrowings before currency swaps (excluding bank overdrafts) [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 1,909 |
Cash flows | 291 |
Exchange adjustment | (67) |
Other | 12 |
Ending balance | 2,145 | 1,909
Exchange of principal [member] | Currency swaps [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 0 |
Cash flows | (5) |
Exchange adjustment | 0 |
Other | (2) |
Ending balance | (7) | 0
Initial fee received [member] | Currency swaps [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Beginning balance | 0 |
Cash flows | 3 |
Exchange adjustment | 0 |
Other | (3) |
Ending balance | $ 0 | $ 0

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