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Strategic Initiatives - Expected Charges (Details) - 2-year Restructuring Plan [Member] - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Maximum [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax $ 480 $ 400
Maximum [Member] | Wealth and Personal Banking [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax 28  
Maximum [Member] | Commercial Banking [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax 10  
Maximum [Member] | Global Banking and Markets [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax 110  
Maximum [Member] | Corporate Center [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax [1] 332  
Minimum [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax 410 $ 350
Minimum [Member] | Wealth and Personal Banking [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax 24  
Minimum [Member] | Commercial Banking [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax 8  
Minimum [Member] | Global Banking and Markets [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax 90  
Minimum [Member] | Corporate Center [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax [1] $ 288  
[1] Includes restructuring charges primarily related to lease impairment and other related costs, as well as severance costs associated with certain centralized activities and functions.