Goodwill, Mortgage Servicing Rights, and Other Intangible Assets - Goodwill by Business Segment and Corporate (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Goodwill [Line Items]
Total goodwill	$ 52,717	$ 52,747	$ 52,565	$ 52,711	$ 52,620	$ 52,634
Corporate
Goodwill [Line Items]
Total goodwill	723		692
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		11,236
Asset & Wealth Management | Operating Segments
Goodwill [Line Items]
Total goodwill	$ 8,622		$ 8,521