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Strategic Initiatives - Branch Closings (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
branch
Dec. 31, 2019
USD ($)
branch
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Restructuring Cost and Reserve [Line Items]            
Number of branches closing | branch     60 20    
Notional value of derivative contracts $ 3,074,468     $ 4,807,851 $ 3,074,468  
Interest rate contracts [Member]            
Restructuring Cost and Reserve [Line Items]            
Notional value of derivative contracts 1,569,281     $ 3,051,548 1,569,281  
Occupancy Expense, Net [Member]            
Restructuring Cost and Reserve [Line Items]            
Lease impairment charges 7 $ (6) $ 52      
Fixed asset impairment charges     $ 16      
2-year Restructuring Plan [Member]            
Restructuring Cost and Reserve [Line Items]            
Trading losses associated with exit of certain derivative contracts 47       57  
Allocated restructuring costs from HTSU 13       55  
2-year Restructuring Plan [Member] | Interest rate contracts [Member]            
Restructuring Cost and Reserve [Line Items]            
Notional value of derivative contracts $ 38,100       $ 38,100  
2-year Restructuring Plan [Member] | Forecast [Member] | Interest rate contracts [Member]            
Restructuring Cost and Reserve [Line Items]            
Notional value of derivative contracts           $ 174,200