Goodwill and Mortgage Servicing Rights (Goodwill by Business Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2019
Goodwill [Line Items]
Goodwill	$ 10,916	$ 9,233
Goodwill [Roll Forward]
Goodwill, beginning balance	9,233
Goodwill, acquired during period	1,599
Goodwill from other increases	84
Goodwill, ending balance	10,916
Retail Banking
Goodwill [Line Items]
Goodwill	6,473	5,795
Goodwill [Roll Forward]
Goodwill, beginning balance	5,795
Goodwill, acquired during period	678
Goodwill, ending balance	6,473
Corporate & Institutional Banking
Goodwill [Line Items]
Goodwill	4,254	3,374
Goodwill [Roll Forward]
Goodwill, beginning balance	3,374
Goodwill, acquired during period	796
Goodwill from other increases	84
Goodwill, ending balance	4,254
Asset Management Group
Goodwill [Line Items]
Goodwill	189	$ 64
Goodwill [Roll Forward]
Goodwill, beginning balance	64
Goodwill, acquired during period	125
Goodwill, ending balance	$ 189