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