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Acquisitions - Proforma Combined Financial Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Eaton Vance Corp.      
Business Acquisition [Line Items]      
Net revenues $ 60,051 $ 50,371  
Net income $ 15,220 10,779  
E-TRADE      
Business Acquisition [Line Items]      
Net revenues   50,203 $ 44,192
Net income   $ 11,459 $ 9,839