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Bank Premises & Equipment - Additional Information (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Bank Premises And Equipment [Line Items]      
Bank premises impairment $ 5 $ 27 $ 41
Branches fair value $ 193 $ 193 $ 314
Branches and undeveloped parcels of land | MB Financial, Inc. | Chicago market      
Bank Premises And Equipment [Line Items]      
Other locations held for sale 11 11  
Other locations fair value $ 10 $ 10  
Impairment as a result of acquisition   $ 14  
2018 Branch Optimization Plan | Lower Limit      
Bank Premises And Equipment [Line Items]      
Branches held for sale 100 100  
2018 Branch Optimization Plan | Upper Limit      
Bank Premises And Equipment [Line Items]      
Branches held for sale 125 125  
Closed in 2019      
Bank Premises And Equipment [Line Items]      
Branches held for sale 65 65  
Closed in 2019 | MB Financial, Inc.      
Bank Premises And Equipment [Line Items]      
Branches held for sale 45 45  
To Be Closed in 2020      
Bank Premises And Equipment [Line Items]      
Branches held for sale 30 30  
To be Closed in 2019      
Bank Premises And Equipment [Line Items]      
Branches held for sale 4 4  
To Be Closed | MB Financial, Inc. | Chicago market      
Bank Premises And Equipment [Line Items]      
Branches held for sale 46 46