Loans and Allowance for Credit Losses - Summary of Loans Modified as TDRs (Detail) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022 USD ($) SecurityLoan	Sep. 30, 2022 USD ($) SecurityLoan
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	13,391	35,911
Pre-Modification Outstanding Loan Balance	$ 279	$ 984
Post-Modification Outstanding Loan Balance	$ 282	$ 967
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	552	1,567
Pre-Modification Outstanding Loan Balance	$ 34	$ 122
Post-Modification Outstanding Loan Balance	$ 35	$ 108
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	24	61
Pre-Modification Outstanding Loan Balance	$ 23	$ 45
Post-Modification Outstanding Loan Balance	$ 23	$ 42
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	283	1,489
Pre-Modification Outstanding Loan Balance	$ 84	$ 418
Post-Modification Outstanding Loan Balance	$ 85	$ 417
Other Retail [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	479	1,963
Pre-Modification Outstanding Loan Balance	$ 14	$ 75
Post-Modification Outstanding Loan Balance	$ 13	$ 70
Credit Card [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	11,632	29,667
Pre-Modification Outstanding Loan Balance	$ 63	$ 161
Post-Modification Outstanding Loan Balance	$ 64	$ 163
Total Loans, Excluding Loans Purchased from GNMA Mortgage Pools [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	12,970	34,747
Pre-Modification Outstanding Loan Balance	$ 218	$ 821
Post-Modification Outstanding Loan Balance	$ 220	$ 800
Government National Mortgage Association [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	421	1,164
Pre-Modification Outstanding Loan Balance	$ 61	$ 163
Post-Modification Outstanding Loan Balance	$ 62	$ 167

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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