Income taxes (Details) $ in Millions	Mar. 31, 2026 USD ($)
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 90
Unrecognized tax benefits that would impact effective tax rate if recognized	90
Accrued interest related to the gross unrecognized tax benefits excluded from the unrecognized tax benefits	24
Accrued penalties related to the gross unrecognized tax benefits excluded from the unrecognized tax benefits	2
Amount of gross unrecognized tax benefits could be reduced by as a result of the revaluation of existing uncertain tax positions	$ 60