Goodwill and intangible assets - Narrative (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) reportingUnit	Sep. 30, 2021 USD ($)
Goodwill [Line Items]
Number of reporting units (reporting unit) | reportingUnit				6
Goodwill impairment	$ 680,000,000	$ 0	$ 0	$ 680,000,000	$ 0
Investment and Wealth Management
Goodwill [Line Items]
Goodwill impairment				680,000,000
Allocated goodwill	$ 7,000,000,000			$ 7,000,000,000
Goodwill impairment loss (as a percentage)	0.07
Discount rate
Goodwill [Line Items]
Impairment testing, measurement input	0.105	0.10		0.105