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Loans and Allowance for Credit Losses - Summary of Loans Modified as TDRs (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
SecurityLoan
Mar. 31, 2019
USD ($)
SecurityLoan
Financing Receivable, Modifications [Line Items]    
Number of Loans | SecurityLoan 12,090 12,788
Pre-Modification Outstanding Loan Balance $ 457 $ 361
Post-Modification Outstanding Loan Balance $ 453 $ 344
Commercial [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | SecurityLoan 999 913
Pre-Modification Outstanding Loan Balance $ 99 $ 36
Post-Modification Outstanding Loan Balance $ 101 $ 29
Commercial Real Estate [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | SecurityLoan 27 20
Pre-Modification Outstanding Loan Balance $ 21 $ 47
Post-Modification Outstanding Loan Balance $ 21 $ 46
Residential Mortgages [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | SecurityLoan 90 96
Pre-Modification Outstanding Loan Balance $ 10 $ 14
Post-Modification Outstanding Loan Balance $ 10 $ 13
Other Retail [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | SecurityLoan 655 573
Pre-Modification Outstanding Loan Balance $ 15 $ 11
Post-Modification Outstanding Loan Balance $ 14 $ 10
Credit Card [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | SecurityLoan 8,415 9,648
Pre-Modification Outstanding Loan Balance $ 46 $ 50
Post-Modification Outstanding Loan Balance $ 47 $ 51
Total Loans, Excluding Loans Purchased from GNMA Mortgage Pools [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | SecurityLoan 10,186 11,250
Pre-Modification Outstanding Loan Balance $ 191 $ 158
Post-Modification Outstanding Loan Balance $ 193 $ 149
Government National Mortgage Association [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | SecurityLoan 1,904 1,538
Pre-Modification Outstanding Loan Balance $ 266 $ 203
Post-Modification Outstanding Loan Balance $ 260 $ 195