Income taxes (Details) $ in Millions	Dec. 31, 2021 USD ($)
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 100
Unrecognized tax benefits that would impact effective tax rate if recognized	100
Accrued interest related to the gross unrecognized tax benefits excluded from the unrecognized tax benefits	20
Decrease in unrecognized tax benefits that is reasonably possible (up to)	$ 40