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Commitments and contingencies - Product Warranty Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Movement in Standard Product Warranty Accrual [Roll Forward]        
Beginning balance     $ 60 $ 18
Increase for warranties issued     8 7
Increase for pre-existing warranties $ 15 $ 6 19 12
Decrease for payments     (16) (12)
Ending balance $ 71 $ 25 $ 71 $ 25