Working capital - Narrative (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Jun. 30, 2025 |
|---|---|---|
| Summary of additional information about working capital [line items] | ||
| Trade receivables | $ 2,596 | $ 2,789 |
| Interest on borrowings | 409 | 352 |
| Accrued Discounts Related To Sales Recognized | 823 | 839 |
| Current contract liabilities | 82 | 84 |
| Provision for employee deferred compensation plan | $ 56 | 53 |
| United States | ||
| Summary of additional information about working capital [line items] | ||
| Trade receivables due from counterparties | 18.00% | |
| India | ||
| Summary of additional information about working capital [line items] | ||
| Trade receivables due from counterparties | 14.00% | |
| United Kingdom | ||
| Summary of additional information about working capital [line items] | ||
| Trade receivables due from counterparties | 15.00% | |
| Non-current liabilities | Fair value | ||
| Summary of additional information about working capital [line items] | ||
| Non-current contingent liabilities | $ (27) | $ (107) |