Goodwill and Mortgage Servicing Rights - Goodwill by Business Segment and Corporate (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Goodwill [Line Items]
Total goodwill	$ 52,706	$ 52,731	$ 52,621	$ 52,565
Corporate
Goodwill [Line Items]
Total goodwill	708	722
Consumer & Community Banking | Operating Segments
Goodwill [Line Items]
Total goodwill	32,116	32,116
Commercial & Investment Bank | Operating Segments
Goodwill [Line Items]
Total goodwill	11,256	11,259
Asset & Wealth Management | Operating Segments
Goodwill [Line Items]
Total goodwill	$ 8,626	$ 8,634