Income taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 242	$ 231	$ 219	$ 626	$ 681
Effective tax rate	38.40%	21.10%	18.80%
Impact of goodwill impairment	19.00%
Tax reserves	$ 130			130		$ 138
Impact on effective tax rate if tax reserves were unnecessary	130			130
Accrued interest, related to income taxes in the balance sheet	38			38
Additional tax expense related to interest				3	$ 6
Reasonably possible decrease in uncertain tax positions within the next 12 months, if a re-evaluation is required	$ 12			$ 12