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Strategic Initiatives - Expected Charges (Details) - 2-year Restructuring Plan [Member] - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Maximum [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax $ 590 $ 590
Maximum [Member] | Wealth and Personal Banking [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax 56  
Maximum [Member] | Commercial Banking [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax 14  
Maximum [Member] | Global Banking and Markets [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax 135  
Maximum [Member] | Corporate Center [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax [1] 385  
Minimum [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax 520 $ 520
Minimum [Member] | Wealth and Personal Banking [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax 50  
Minimum [Member] | Commercial Banking [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax 10  
Minimum [Member] | Global Banking and Markets [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax 115  
Minimum [Member] | Corporate Center [Member]    
Restructuring Cost and Reserve [Line Items]    
Expected restructuring charges, pre-tax [1] $ 345  
[1] Includes restructuring charges primarily related to lease impairment and other related costs, support service project costs and severance costs associated with certain centralized activities and functions.