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Loans and Allowance for Credit Losses - Summary of Loans Modified as TDRs (Detail)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
SecurityLoan
Sep. 30, 2019
USD ($)
SecurityLoan
Sep. 30, 2020
USD ($)
SecurityLoan
Sep. 30, 2019
USD ($)
SecurityLoan
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 7,066 11,802 28,005 35,680
Pre-Modification Outstanding Loan Balance $ 634 $ 433 $ 1,486 $ 1,193
Post-Modification Outstanding Loan Balance $ 506 $ 406 $ 1,321 $ 1,138
Commercial [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 699 886 2,837 2,622
Pre-Modification Outstanding Loan Balance $ 262 $ 116 $ 505 $ 242
Post-Modification Outstanding Loan Balance $ 159 $ 100 $ 375 $ 215
Commercial Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 51 32 116 76
Pre-Modification Outstanding Loan Balance $ 105 $ 23 $ 165 $ 95
Post-Modification Outstanding Loan Balance $ 81 $ 23 $ 141 $ 93
Residential Mortgages [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 374 117 585 318
Pre-Modification Outstanding Loan Balance $ 108 $ 17 $ 142 $ 43
Post-Modification Outstanding Loan Balance $ 108 $ 15 $ 142 $ 41
Other Retail [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 508 814 1,537 2,029
Pre-Modification Outstanding Loan Balance $ 26 $ 20 $ 50 $ 44
Post-Modification Outstanding Loan Balance $ 26 $ 19 $ 48 $ 42
Credit Card [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 4,699 8,429 19,282 26,018
Pre-Modification Outstanding Loan Balance $ 27 $ 46 $ 110 $ 140
Post-Modification Outstanding Loan Balance $ 27 $ 46 $ 112 $ 141
Total Loans, Excluding Loans Purchased from GNMA Mortgage Pools [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 6,331 10,278 24,357 31,063
Pre-Modification Outstanding Loan Balance $ 528 $ 222 $ 972 $ 564
Post-Modification Outstanding Loan Balance $ 401 $ 203 $ 818 $ 532
Government National Mortgage Association [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Loans | SecurityLoan 735 1,524 3,648 4,617
Pre-Modification Outstanding Loan Balance $ 106 $ 211 $ 514 $ 629
Post-Modification Outstanding Loan Balance $ 105 $ 203 $ 503 $ 606