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Loans and Other Borrowings - Summary of Loans and Other Borrowings (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |
Current | $ 869 | $ 87 | $ 104
Non-current | 2,898 | 2,078 | $ 1,910
Total | 3,767 | 2,165 |
Unsecured bank loans [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current |  | 125 |
Total |  | 125 |
GBP173m 3.875% bonds 2022 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current | 235 | 528 |
Total | 235 | 528 |
EUR500m 1.625% bonds 2024 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current | 611 |  |
Total | 611 |  |
GBP300m 3.75% bonds 2025 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current | 413 | 399 |
Total | 413 | 399 |
GBP350m 2.125% bonds 2026 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current | 479 | 462 |
Total | 479 | 462 |
EUR500m 2.125% bonds 2027 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current | 618 | 564 |
Total | 618 | 564 |
GBP400m 3.375% bonds 2028 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current | 542 |  |
Total | 542 |  |
Commercial paper [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 818 |  |
Total | 818 |  |
Bank Overdrafts [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 51 | 87 |
Total | 51 | 87 |
Unsecured bank loans, bonds and commercial paper [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 818 |  |
Non-current | 2,898 | 2,078 |
Total | 3,716 | 2,078 |
Sterling [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 821 | 2 |
Non-current | 1,669 | 1,389 |
Total | 2,490 | 1,391 |
US dollars [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 31 | 82 |
Non-current |  | 125 |
Total | 31 | 207 |
Euros [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 13 | 1 |
Non-current | 1,229 | 564 |
Total | 1,242 | 565 |
Other currencies [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 4 | 2 |
Total | $ 4 | $ 2 |

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