Income taxes (Details) $ in Millions	Sep. 30, 2022 USD ($)
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 108
Unrecognized tax benefits that would impact effective tax rate if recognized	108
Accrued interest related to the gross unrecognized tax benefits excluded from the unrecognized tax benefits	20
Accrued penalties related to the gross unrecognized tax benefits excluded from the unrecognized tax benefits	7
Decrease in unrecognized tax benefits that is reasonably possible (up to)	$ 30