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Operating costs - Operating costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Expense by nature [line items]      
Excise duties $ 7,622 $ 7,715 [1] $ 9,235 [1]
Cost of sales 8,071 8,289 [1] 7,923 [1]
Marketing 3,691 3,663 [1] 3,616 [1]
Other operating items 2,506 3,056 [1] 3,080 [1]
Operating expenses 21,890 22,723 23,854
Increase in inventories (112) (615) (1,208)
Raw materials and consumables 4,892 5,197 5,336
Marketing 3,691 3,663 [1] 3,616 [1]
Other external charges 3,002 3,301 3,432
Staff costs 2,314 2,197 2,385
Depreciation, amortisation and impairment 493 1,297 1,064
Gains on disposal of properties 1 (4) (2)
Net foreign exchange losses 8 12 14
Other operating income (21) (40) (18)
India      
Expense by nature [line items]      
Excise duties 1,845 1,950 2,901
United Kingdom      
Expense by nature [line items]      
Excise duties 1,463 1,314 1,558
United States      
Expense by nature [line items]      
Excise duties 738 825 816
Other      
Expense by nature [line items]      
Excise duties $ 3,576 $ 3,626 $ 3,960
[1] (1)  See pages 238-240 for an explanation under Accounting information and policies.