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Contingencies and commitments - Summary of aggregate amount of future payment commitments under purchase obligations outstanding (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of contingent liabilities [line items] |  |
Aggregate amount of future payment commitments under purchase obligations outstanding | $ 12,355 | $ 14,546
Within 1 year |  |
Disclosure of contingent liabilities [line items] |  |
Aggregate amount of future payment commitments under purchase obligations outstanding | 3,160 | 2,927
Between 1 and 2 years |  |
Disclosure of contingent liabilities [line items] |  |
Aggregate amount of future payment commitments under purchase obligations outstanding | 1,461 | 1,663
Between 2 and 3 years |  |
Disclosure of contingent liabilities [line items] |  |
Aggregate amount of future payment commitments under purchase obligations outstanding | 1,364 | 1,496
Between 3 and 4 years |  |
Disclosure of contingent liabilities [line items] |  |
Aggregate amount of future payment commitments under purchase obligations outstanding | 851 | 1,147
Between 4 and 5 years |  |
Disclosure of contingent liabilities [line items] |  |
Aggregate amount of future payment commitments under purchase obligations outstanding | 614 | 948
After 5 years |  |
Disclosure of contingent liabilities [line items] |  |
Aggregate amount of future payment commitments under purchase obligations outstanding | $ 4,905 | $ 6,365

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