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Segmental information - Geographical analysis (Details) - USD ($)
$ in Millions
6 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of geographical areas [line items]    
Sales $ 15,181 $ 15,611 [1]
United States    
Disclosure of geographical areas [line items]    
Sales 4,158 4,268
India    
Disclosure of geographical areas [line items]    
Sales 1,687 1,886
Great Britain    
Disclosure of geographical areas [line items]    
Sales 1,571 1,373
Rest of World    
Disclosure of geographical areas [line items]    
Sales $ 7,765 $ 8,084
[1] (1)See page F-7 for an explanation under Basis of preparation.