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Bank Premises & Equipment (Bank Premises and Equipment - Additional Information) (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Bank Premises and Equipment    
Bank premises impairment $ 20 $ 8
Branches fair value 173 $ 404
Branches and undeveloped parcels of land | Chicago market    
Bank Premises and Equipment    
Bank premises impairment $ 14  
Branches held for sale 46  
Branches and undeveloped parcels of land | Chicago market | MB Financial, Inc.    
Bank Premises and Equipment    
Branches held for sale 9  
Other locations held for sale 10  
Branches fair value $ 10  
Other locations fair value 11  
2018 Branch Optimization Plan    
Bank Premises and Equipment    
Bank premises impairment $ 3  
Land and improvements 21  
Branches held for sale 31  
Other locations held for sale 21  
2018 Branch Optimization Plan | Lower Limit    
Bank Premises and Equipment    
Branches held for sale 100  
2018 Branch Optimization Plan | Upper Limit    
Bank Premises and Equipment    
Branches held for sale 125