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Business Combination - Allocation of Purchase Price (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 01, 2021
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]      
Goodwill   $ 232 $ 5
Boston Private      
Business Acquisition [Line Items]      
Cash paid $ 174    
Share-based consideration 1,050    
Replacement equity awards 10    
Total purchase consideration 1,234    
Fair value of net assets acquired 1,033    
Goodwill $ 201