Commitment and contingencies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Other Commitments [Line Items]
Other contractual commitments	$ 711		$ 711
Increase for pre-existing warranties	15	$ 6	19	$ 12
Accrued environmental remediation obligations	66		66		$ 64
Outstanding commitments	822		822		809
Self insurance reserves	120		120		$ 89
Capital Addition Purchase Commitments
Other Commitments [Line Items]
Purchase commitments	$ 263		$ 263

Total costs accrued as of the balance sheet date for environmental loss contingencies.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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