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Goodwill and Other Intangible Assets - Asset Management Business Acquisition Description (Details) - USD ($)
$ in Millions
Nov. 08, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Asset management business acquisition        
Goodwill   $ 1,458 $ 1,176 $ 1,167
Asset Management Segment        
Asset management business acquisition        
Goodwill   $ 1,088 $ 806 $ 797
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      
Goodwill 287      
European-based asset management business of BMO Financial Group | Asset Management Segment        
Asset management business acquisition        
Goodwill 287      
European-based asset management business of BMO Financial Group | General and Administrative Expense        
Asset management business acquisition        
Acquisition related costs $ 32