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Segments (Results of Operations and Average Assets by Segment) (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Segment Reporting Information          
Other Asset Impairment Charges     $ (5) $ (34)  
Unamortized debt issuance costs   $ 30   30 $ 34
Bank premises and equipment held for sale $ 52   52   $ 81
Branch Banking          
Segment Reporting Information          
Impairment of Branches and Land 1 98 3 102  
Commercial Banking | Operating lease equipment          
Segment Reporting Information          
Other Asset Impairment Charges 5 4 5 34  
General Corporate and Other          
Segment Reporting Information          
Bank premises and equipment held for sale $ 52 $ 84 $ 52 $ 84