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Working capital - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Jun. 30, 2023
Summary of additional information about working capital [line items]    
Trade receivables $ 2,674 $ 2,534
Interest on borrowings 291 274
Accrued Discounts Related To Sales Recognized (764) (707)
Current contract liabilities 92 109
Supply chain financing facilities accounted as trade payables 847 916
Provision for employee deferred compensation plan $ 54 64
United States    
Summary of additional information about working capital [line items]    
Trade receivables due from counterparties 21.00%  
India    
Summary of additional information about working capital [line items]    
Trade receivables due from counterparties 16.00%  
United Kingdom    
Summary of additional information about working capital [line items]    
Trade receivables due from counterparties 9.00%  
Non-current liabilities | Fair value    
Summary of additional information about working capital [line items]    
Non-current contingent liabilities $ (231) $ (369)