Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions	Nov. 08, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Asset management business acquisition
Goodwill		$ 1,389	$ 1,458	$ 1,176
Asset Management
Asset management business acquisition
Goodwill		$ 1,019	$ 1,088	$ 806
European-based asset management business of BMO Financial Group
Asset management business acquisition
Cash paid	$ 973
Reduction due to customary deferred and contingent adjustments	7
Assets under management	136,000
European-based asset management business of BMO Financial Group | Asset Management
Asset management business acquisition
Goodwill	$ 287