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Financial instruments - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2025 | Jun. 30, 2023 | Jun. 30, 2022
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Financial liability including put option | $ 371 | $ 524 | [1] |  | $ 453 | [1] |
Fair value of gross borrowings | 21,480 |  |  |  | 20,791 |  |
Level 3 |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Contingent consideration included in other financial liabilities | 599 | 690 |  |  | 665 |  |
Increase (Decrease) in financial assets | (32) | 17 |  |  |  |  |
Level 1 | Fair value |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Fair value of gross borrowings | 21,001 |  |  |  | 19,707 |  |
Contingent consideration | Volume, Measurement Input |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Increase in fair value of liability | 40 |  |  |  |  |  |
Decrease in fair value of liability | $ 40 |  |  |  |  |  |
Percentage of reasonably possible decrease in unobservable input, liabilities | 10.00% |  |  |  |  |  |
Percentage of reasonably possible increase in unobservable input, liabilities | 10.00% |  |  |  |  |  |
Contingent consideration | Cash Flows, Measurement Input |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Increase in fair value of liability | $ 30 |  |  |  |  |  |
Decrease in fair value of liability | $ 30 |  |  |  |  |  |
Percentage of reasonably possible decrease in unobservable input, liabilities | 10.00% |  |  |  |  |  |
Percentage of reasonably possible increase in unobservable input, liabilities | 10.00% |  |  |  |  |  |
Contingent consideration | Level 3 |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Contingent consideration included in other financial liabilities | $ 375 | $ 430 |  |  | 391 |  | $ 449
Business combinations |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Contingent consideration payment period | 8 years |  |  |  |  |  |
Business combinations | Contingent consideration | Undiscounted amount |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Contingent consideration included in other financial liabilities | $ 507 |  |  |  |  |  |
Aviation Gin and Davos Brands | Contingent consideration | Level 3 |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Contingent consideration included in other financial liabilities | 144 |  |  |  | 142 |  |
21 Seed | Contingent consideration | Level 3 |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Contingent consideration included in other financial liabilities | 76 |  |  |  | 75 |  |
Don Papa Rum | Contingent consideration | Level 3 |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Contingent consideration included in other financial liabilities | $ 93 |  |  |  | 89 |  |
Industrias Licoreras de Guatemala |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Equity stake held by external party | 50.00% |  |  |  |  |  |
Industrias Licoreras de Guatemala | Level 3 |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Financial liability including put option | $ 224 |  |  |  | $ 274 |  |
Industrias Licoreras de Guatemala | Option exercised two years later |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |
Increase in fair value of liability |  |  |  | $ 37 |  |  |
[1] | (1) See page F-7 for an explanation under Basis of preparation.

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