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Loans and Allowance for Credit Losses - Changes in Accretable Balance for Purchased Impaired Loans (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Deteriorated Loans Transferred in [Abstract]        
Balance at beginning of period $ 1,013 $ 1,187 $ 957 $ 1,309
Accretion (103) (100) (195) (198)
Disposals (33) (43) (54) (70)
Reclassifications from nonaccretable difference 14 32 183 37
Other       (2)
Balance at end of period $ 891 $ 1,076 $ 891 $ 1,076