Loans - Summary of Nonaccrual Loans (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	$ 2,251	$ 2,469
Total divided by gross loans at amortized cost	1.40%	1.70%
Nonaccrual loans allowance for loans losses divided by total	215.30%	144.70%
30 days or more past due
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	$ 598	$ 254
Corporate
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	1,422	1,559
Wealth management
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	213	21
Commercial real estate
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	574	841
Residential real estate
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	4	5
Installment
Financing Receivable, Impaired [Line Items]
Nonaccrual loans	38	43
Corporate and Commercial Real Estate Loans
Financing Receivable, Impaired [Line Items]
Loans modified in troubled debt restructuring	$ 212	$ 267

Ratio of allowance for non accrual loans losses divided by gross total.

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+ References

No definition available.

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Amount of financing receivable modified as troubled debt restructuring.

+ 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953550-111524

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- Definition

Reflects the percentage derived from dividing impaired loans on which interest has ceased to be accrued by total loans.

+ References

No definition available.

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