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Borrowings - Additional Information (Details) £ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 29, 2024 | Dec. 31, 2024 GBP (£) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 EUR (€) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 GBP (£) | Mar. 31, 2024 EUR (€) | Dec. 31, 2023 GBP (£) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 EUR (€)
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Borrowings | £ |  | £ 4,328 |  |  |  |  |  | £ 4,721 |  |
USD Bonds Due September 2042 |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Notional amount of hedged items | $ |  |  | $ 93 |  |  |  |  |  |  |
Average interest rate |  | 5.125% | 5.125% | 5.125% |  |  |  |  |  |
USD Bonds Due November 2043 |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Notional amount of hedged items | $ |  |  | $ 220 |  |  |  |  |  |  |
Average interest rate |  | 5.625% | 5.625% | 5.625% |  |  |  |  |  |
USD Bonds Due September 2024 |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Notional amount of hedged items | $ |  |  |  |  | $ 750 |  |  |  |  |
Adjustment to floating basis |  | 3.75% | 3.75% | 3.75% |  |  |  |  |  |
Eurobonds Due March 2025 |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Notional amount of hedged items |  |  |  | € 500,000,000 |  |  |  |  |  |
Average interest rate |  | 1.375% | 1.375% | 1.375% |  |  |  |  |  |
Eurobonds Due September 2026 |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Notional amount of hedged items |  |  |  | € 750,000,000 |  |  |  |  |  |
Average interest rate |  | 2.25% | 2.25% | 2.25% |  |  |  |  |  |
Euro bonds Due May 2027 |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Notional amount of hedged items |  |  |  | € 750,000,000 |  |  |  |  |  |
Average interest rate |  | 2.375% | 2.375% | 2.375% |  |  |  |  |  |
Eurobonds Due May 2028 |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Notional amount of hedged items |  |  |  | € 550,000,000 |  |  |  |  |  |
Average interest rate |  | 4.125% | 4.125% | 4.125% |  |  |  |  |  |
Borrowings repurchased |  |  |  | € 200,000,000 |  |  |  |  |  |
Euro Bonds Due September 2029 |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Notional amount of hedged items |  |  |  | € 351,000,000 |  |  | € 600,000,000 |  |  |
Average interest rate |  | 3.625% | 3.625% | 3.625% |  |  |  |  |  |
Borrowings repurchased |  |  |  | € 249,000,000 |  |  |  |  |  |
Eurobonds Due March 2030 |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Notional amount of hedged items |  |  |  | € 600,000,000 |  |  |  |  |  |
Average interest rate |  | 1.625% | 1.625% | 1.625% |  |  |  |  |  |
Eurobonds Due September 2033 |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Notional amount of hedged items |  |  |  | € 500,000,000 |  |  | € 650,000,000 |  |  |
Average interest rate |  | 4.00% | 4.00% | 4.00% |  |  |  |  |  |
Borrowings repurchased |  |  |  | € 150,000,000 |  |  |  |  |  |
Sterling bonds due May 2032 |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Notional amount of hedged items | £ |  | £ 250 |  |  |  |  |  |  |  |
Average interest rate |  | 3.75% | 3.75% | 3.75% |  |  |  |  |  |
Sterling Bonds Due September 2046 |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Notional amount of hedged items | £ |  | £ 380 |  |  |  | £ 20 |  |  |  |
Average interest rate |  |  |  |  |  | 2.875% |  |  |  |
US Revolving Credit Facilities March 2026 |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Notional amount of hedged items |  | £ 2,500 | $ 2,500 |  |  |  |  |  |  |
Borrowings term |  | 5 years |  |  |  |  |  |  |  |
Extension option term |  | 2 years |  |  |  |  |  |  |  |
US Revolving Credit Facilities February 2029 |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Borrowings term | 5 years |  |  |  |  |  |  |  |  |
Extension option term |  | 2 years |  |  |  |  |  |  |  |
US revolving credit facilities |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Average interest rate |  |  |  |  |  |  |  | 4.54% | 4.54% | 4.54%
Borrowings averaged equivalent | $ |  |  |  |  |  |  |  |  | $ 41 |
US commercial paper |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Average interest rate |  | 5.36% | 5.36% | 5.36% |  |  |  | 5.45% | 5.45% | 5.45%
Borrowings |  |  |  | € 0 |  |  |  |  |  |
US commercial paper | Weighted average |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Borrowings | $ |  |  | $ 194 |  |  |  |  |  | $ 433 |
Euro commercial paper |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Average interest rate |  |  |  |  |  |  |  | 4.90% | 4.90% | 4.90%
Borrowings |  |  |  | 0 |  |  |  |  |  |
Euro commercial paper | Weighted average |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  | € 0 |  |  |  |  |  | € 45,000,000
Corporate bond |  |  |  |  |  |  |  |  |  |
Disclosure of bank overdraft bonds and bank loans [line items] |  |  |  |  |  |  |  |  |  |
Fair value of corporate bonds | £ |  | £ 3,964 |  |  |  |  |  | £ 4,120 |  |

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