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Loans and Allowance for Credit Losses - Summary of Impaired Loans, which Include Nonaccrual and TDR Loans, by Portfolio Class (Parenthetical) (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Loan and Lease Receivables, Impaired [Abstract]  
Interest income recognized on impaired loans $ 237
Interest income that would have been recognized on impaired loans at original contractual loan terms $ 308