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Working capital - Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Jun. 30, 2024
Summary Of Additional Information About Working Capital [Abstract]    
Raw materials and consumables $ 604 $ 639
Work in progress 131 118
Maturing inventories 8,677 7,832
Finished goods and goods for resale 1,246 1,131
Inventories $ 10,658 $ 9,720