Goodwill, Mortgage Servicing Rights, and Other Intangible Assets - Goodwill by Business Segment (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Total goodwill	$ 52,634	$ 51,662	$ 50,315	$ 49,248
Corporate
Goodwill [Line Items]
Total goodwill	685	646	727
Consumer & Community Banking | Operating Segments
Goodwill [Line Items]
Total goodwill	32,116	32,121	31,474
Corporate & Investment Bank | Operating Segments
Goodwill [Line Items]
Total goodwill	8,266	8,008	7,906
Commercial Banking | Operating Segments
Goodwill [Line Items]
Total goodwill	2,985	2,985	2,986
Asset & Wealth Management | Operating Segments
Goodwill [Line Items]
Total goodwill	$ 8,582	$ 7,902	$ 7,222