Goodwill and Mortgage Servicing Rights (Goodwill by Business Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Line Items]
Goodwill	$ 10,932	$ 10,987
Goodwill [Roll Forward]
Goodwill, beginning balance	10,987	10,916
Goodwill from other increases	(55)	71
Goodwill, ending balance	10,932	10,987
Retail Banking
Goodwill [Line Items]
Goodwill	6,473	6,473
Goodwill [Roll Forward]
Goodwill, beginning balance	6,473	6,473
Goodwill, ending balance	6,473	6,473
Corporate & Institutional Banking
Goodwill [Line Items]
Goodwill	4,270	4,325
Goodwill [Roll Forward]
Goodwill, beginning balance	4,325	4,254
Goodwill from other increases	(55)	71
Goodwill, ending balance	4,270	4,325
Asset Management Group
Goodwill [Line Items]
Goodwill	189	189
Goodwill [Roll Forward]
Goodwill, beginning balance	189	189
Goodwill, ending balance	$ 189	$ 189