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Loans and Other Borrowings - Summary of Loans and Other Borrowings (Detail) £ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2021 GBP (£) | Dec. 31, 2020 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |
Current | $ 292 |  | $ 869
Non-current | 2,553 |  | 2,898
Total | 2,845 |  | 3,767
GBP173m 3.875% bonds 2022 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 233 |  |
Non-current | 0 |  | 235
Total | $ 233 |  | 235
Maturity date | 28 November 2022 |  |
Discount at issue % | 1.213% | 1.213% |
EUR500m 1.625% bonds 2024 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current | $ 565 |  | 611
Maturity date | 8 October 2024 |  |
Discount at issue % | 0.437% | 0.437% |
GBP300m 3.75% bonds 2025 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current | $ 408 |  | 413
Total | $ 408 |  | 413
Maturity date | 14 August 2025 |  |
Discount at issue % | 0.986% | 0.986% |
GBP350m 2.125% bonds 2026 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current | $ 473 |  | 479
Total | $ 473 |  | 479
Maturity date | 24 August 2026 |  |
Discount at issue % | 0.55% | 0.55% |
EUR500m 2.125% bonds 2027 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current | $ 570 |  | 618
Maturity date | 15 May 2027 |  |
Discount at issue % | 0.47% | 0.47% |
GBP400m 3.375% bonds 2028 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Non-current | $ 537 |  | 542
Maturity date | 8 October 2028 |  |
Discount at issue % | 1.034% | 1.034% |
Commercial paper [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current |  |  | 818
Total | £ |  | £ 600 |
Maturity date | 16 March 2021 |  |
Discount at issue % | 0.444% | 0.444% |
Bank Overdrafts [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | $ 59 |  | 51
Maturity date | n/a |  |
Sterling [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total | $ 1,652 |  | 2,490
US dollars [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total | 57 |  | 31
Euros [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total | 1,135 |  | 1,242
Other currencies [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total | $ 1 |  | $ 4

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