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Bank Premises & Equipment (Bank Premises and Equipment - Additional Information) (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
Sep. 30, 2016
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Bank Premises and Equipment        
Gain on Branch Consolidation and Sales Plan $ 0   $ 8 [1]  
Land and improvements held for sale 33     $ 29
Buildings held for sale 16     9
Equipment Held For Sale 2     1
Land and improvements [2] 649     663
Buildings [2] 1,667     1,672
Equipment 1,773     1,761
Branch Banking        
Bank Premises and Equipment        
Bank premises impairment $ 3   $ 2  
Disposal group classified as held for sale        
Bank Premises and Equipment        
Operating Branch Locations 43      
Parcels Of Undeveloped Land 33      
Disposal group classified as held for sale | September 13 2016 Announcement        
Bank Premises and Equipment        
Parcels Of Undeveloped Land   5    
Branches and undeveloped parcels of land        
Bank Premises and Equipment        
Land and improvements $ 92     $ 92
Branches and undeveloped parcels of land | September 13 2016 Announcement        
Bank Premises and Equipment        
Operating Branch Locations   44    
Branch Consolidation and Sales Plan | Disposal group classified as held for sale | Bank Premises And Equipment | September 13 2016 Announcement        
Bank Premises and Equipment        
Land and improvements held for sale 33      
Buildings held for sale 16      
Equipment Held For Sale 2      
Land and improvements 36      
Buildings 16      
Equipment $ 2      
[1]

A net tax deficiency of $ 1 million was reclassified from capital surplus to applicable income tax expense at March 31, 2016, related to the early adoption of ASU 2016-09 during the fourth quarter of 2016, with an effective date of January 1, 2016.

[2]

(a ) At both March 31, 2017 and December 31, 2016 , land and improvements , buildings and construction in progress i ncluded $ 92 associated w ith parcels of undeveloped land intended for future branch expansion.