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Goodwill and Mortgage Servicing Rights (Goodwill by Business Segment) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Jun. 01, 2021
Goodwill [Line Items]      
Goodwill $ 10,987 $ 10,916 $ 1,600
Goodwill [Roll Forward]      
Goodwill, beginning balance 10,916 9,233  
Goodwill, acquired during period   1,599  
Goodwill from other increases 71 84  
Goodwill, ending balance 10,987 10,916  
Retail Banking      
Goodwill [Line Items]      
Goodwill 6,473 6,473  
Goodwill [Roll Forward]      
Goodwill, beginning balance 6,473 5,795  
Goodwill, acquired during period   678  
Goodwill, ending balance 6,473 6,473  
Corporate & Institutional Banking      
Goodwill [Line Items]      
Goodwill 4,325 4,254  
Goodwill [Roll Forward]      
Goodwill, beginning balance 4,254 3,374  
Goodwill, acquired during period   796  
Goodwill from other increases 71 84  
Goodwill, ending balance 4,325 4,254  
Asset Management Group      
Goodwill [Line Items]      
Goodwill 189 189  
Goodwill [Roll Forward]      
Goodwill, beginning balance 189 64  
Goodwill, acquired during period   125  
Goodwill, ending balance $ 189 $ 189