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Loans and Allowance for Credit Losses - Summary of Loans Modified as TDRs in the Past Twelve Months that have Subsequently Defaulted (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
SecurityLoan
Jun. 30, 2017
USD ($)
SecurityLoan
Jun. 30, 2018
USD ($)
SecurityLoan
Jun. 30, 2017
USD ($)
SecurityLoan
Financing Receivable, Modifications [Line Items]        
Number of Loans 2,763 2,513 5,412 5,160
Amount Defaulted | $ $ 88 $ 55 $ 146 $ 115
Commercial [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans 177 182 416 355
Amount Defaulted | $ $ 3 $ 16 $ 12 $ 24
Commercial Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans 8 10 16 18
Amount Defaulted | $ $ 2 $ 1 $ 6 $ 3
Residential Mortgages [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans 58 95 114 167
Amount Defaulted | $ $ 7 $ 10 $ 11 $ 19
Other Retail [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans 70 102 147 231
Amount Defaulted | $ $ 1 $ 1 $ 2 $ 3
Credit Card [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans 1,933 1,984 3,969 4,031
Amount Defaulted | $ $ 8 $ 8 $ 17 $ 17
Total Loans, Excluding GNMA and Covered Loans [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans 2,246 2,373 4,662 4,802
Amount Defaulted | $ $ 21 $ 36 $ 48 $ 66
Covered Loans [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans   1 1 1
Government National Mortgage Association [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans 517 139 749 357
Amount Defaulted | $ $ 67 $ 19 $ 98 $ 49