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LHFI Considered Impaired (Additional Information) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Loans and Leases Receivable, Gross [1] $ 151,839 $ 143,181  
Transfer of Loans Held-for-sale to Portfolio Loans 28 19 $ 30
Financing Receivable, Modifications, Post-Modification Recorded Investment 266 373 $ 482
Accrual Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Financing Receivable, Modifications, Recorded Investment $ 2,300 $ 2,400  
Percentage Of Accruing Troubled Debt Restructurings, Current 97.00% 96.00%  
Commercial Portfolio Segment [Member]      
Financing Receivable, Impaired [Line Items]      
Loans and Leases Receivable, Gross $ 80,940 $ 75,477  
Consumer Other Direct [Member]      
Financing Receivable, Impaired [Line Items]      
Loans and Leases Receivable, Gross $ 10,615 $ 8,729  
[1] Includes loans of consolidated VIEs of $153 million and $179 million at December?31, 2018 and December?31, 2017, respectively.