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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, 2019
USD ($)
SecurityLoan
Jun. 30, 2018
USD ($)
SecurityLoan
Jun. 30, 2019
USD ($)
SecurityLoan
Jun. 30, 2018
USD ($)
SecurityLoan
Financing Receivable, Modifications [Line Items]        
Number of Loans 2,586 2,763 5,249 5,412
Amount Defaulted | $ $ 65 $ 88 $ 119 $ 146
Commercial [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans 252 177 486 416
Amount Defaulted | $ $ 4 $ 3 $ 9 $ 12
Commercial Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans 7 8 15 16
Amount Defaulted | $ $ 4 $ 2 $ 10 $ 6
Residential Mortgages [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans 15 58 111 114
Amount Defaulted | $ $ 3 $ 7 $ 13 $ 11
Other Retail [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans 80 70 227 147
Amount Defaulted | $ $ 1 $ 1 $ 8 $ 2
Credit Card [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans 1,922 1,933 3,976 3,969
Amount Defaulted | $ $ 10 $ 8 $ 19 $ 17
Covered Loans [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans       1
Total Loans, Excluding Loans Purchased from GNMA Mortgage Pools [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans 2,276 2,246 4,815 4,663
Amount Defaulted | $ $ 22 $ 21 $ 59 $ 48
Government National Mortgage Association [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans 310 517 434 749
Amount Defaulted | $ $ 43 $ 67 $ 60 $ 98