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 ($) SecurityLoan	Sep. 30, 2021 USD ($) SecurityLoan	Sep. 30, 2022 USD ($) SecurityLoan	Sep. 30, 2021 USD ($) SecurityLoan
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	13,391	8,531	35,911	24,209
Pre-Modification Outstanding Loan Balance	$ 279	$ 272	$ 984	$ 1,001
Post-Modification Outstanding Loan Balance	$ 282	$ 279	$ 967	$ 980
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	552	506	1,567	1,736
Pre-Modification Outstanding Loan Balance	$ 34	$ 46	$ 122	$ 133
Post-Modification Outstanding Loan Balance	$ 35	$ 47	$ 108	$ 120
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	24	14	61	100
Pre-Modification Outstanding Loan Balance	$ 23	$ 12	$ 45	$ 136
Post-Modification Outstanding Loan Balance	$ 23	$ 13	$ 42	$ 125
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	283	171	1,489	867
Pre-Modification Outstanding Loan Balance	$ 84	$ 54	$ 418	$ 299
Post-Modification Outstanding Loan Balance	$ 85	$ 54	$ 417	$ 298
Other Retail [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	479	382	1,963	2,175
Pre-Modification Outstanding Loan Balance	$ 14	$ 9	$ 75	$ 64
Post-Modification Outstanding Loan Balance	$ 13	$ 9	$ 70	$ 58
Credit Card [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	11,632	6,656	29,667	17,492
Pre-Modification Outstanding Loan Balance	$ 63	$ 38	$ 161	$ 102
Post-Modification Outstanding Loan Balance	$ 64	$ 38	$ 163	$ 103
Total loans, excluding loans purchased from GNMA mortgage pools [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	12,970	7,729	34,747	22,370
Pre-Modification Outstanding Loan Balance	$ 218	$ 159	$ 821	$ 734
Post-Modification Outstanding Loan Balance	$ 220	$ 161	$ 800	$ 704
Loans purchased from GNMA mortgage pools [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans \| SecurityLoan	421	802	1,164	1,839
Pre-Modification Outstanding Loan Balance	$ 61	$ 113	$ 163	$ 267
Post-Modification Outstanding Loan Balance	$ 62	$ 118	$ 167	$ 276

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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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