Goodwill, Mortgage Servicing Rights, and Other Intangible Assets - Goodwill by Business Segment and Corporate (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Goodwill [Line Items]
Total goodwill	$ 52,636	$ 52,634	$ 52,144	$ 51,662
Corporate
Goodwill [Line Items]
Total goodwill	679	685
Consumer & Community Banking | Operating Segments
Goodwill [Line Items]
Total goodwill	32,116	32,116
Corporate & Investment Bank | Operating Segments
Goodwill [Line Items]
Total goodwill	8,291	8,266
Commercial Banking | Operating Segments
Goodwill [Line Items]
Total goodwill	2,985	2,985
Asset & Wealth Management | Operating Segments
Goodwill [Line Items]
Total goodwill	$ 8,565	$ 8,582