Loans and Allowance for Credit Losses - Summary of Loans Modified as TDRs (Detail) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2023 USD ($) SecurityLoan	Jun. 30, 2023 USD ($) SecurityLoan
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	10,705	22,520
Pre-Modification Outstanding Loan Balance	$ 286	$ 705
Post-Modification Outstanding Loan Balance	$ 275	$ 685
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	506	1,015
Pre-Modification Outstanding Loan Balance	$ 50	$ 88
Post-Modification Outstanding Loan Balance	$ 41	$ 73
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	28	37
Pre-Modification Outstanding Loan Balance	$ 11	$ 22
Post-Modification Outstanding Loan Balance	$ 9	$ 19
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	366	1,206
Pre-Modification Outstanding Loan Balance	$ 106	$ 334
Post-Modification Outstanding Loan Balance	$ 106	$ 332
Other Retail [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	756	1,484
Pre-Modification Outstanding Loan Balance	$ 24	$ 61
Post-Modification Outstanding Loan Balance	$ 20	$ 57
Credit Card [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	8,696	18,035
Pre-Modification Outstanding Loan Balance	$ 48	$ 98
Post-Modification Outstanding Loan Balance	$ 49	$ 99
Total Loans, Excluding Loans Purchased from GNMA Mortgage Pools [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	10,352	21,777
Pre-Modification Outstanding Loan Balance	$ 239	$ 603
Post-Modification Outstanding Loan Balance	$ 225	$ 580
Government National Mortgage Association [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	353	743
Pre-Modification Outstanding Loan Balance	$ 47	$ 102
Post-Modification Outstanding Loan Balance	$ 50	$ 105

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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