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Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Goodwill [Line Items]    
Total goodwill $ 69,023 $ 68,951
Operating Segments | Consumer Banking    
Goodwill [Line Items]    
Total goodwill 30,137 30,123
Operating Segments | Global Wealth & Investment Management    
Goodwill [Line Items]    
Total goodwill 9,677 9,677
Operating Segments | Global Banking    
Goodwill [Line Items]    
Total goodwill 24,027 23,969
Operating Segments | Global Markets    
Goodwill [Line Items]    
Total goodwill $ 5,182 $ 5,182