Variable Interest Entities - Firm Sponsored VIEs (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Total assets held by securitization VIEs	$ 228,150,000,000	$ 229,986,000,000
Retained securitization interests, risk-rated 'A' or better, at fair value	83.00%	84.00%
Corporate & Investment Bank
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Senior securities purchased in connection with CIB's secondary market-making activities	$ 3,000,000	$ 134,000,000
Subordinated securities purchased in connection with CIB's secondary market-making activities	0	34,000,000
Residential mortgage \| Investment-grade
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Fair value of retained interests	2,800,000,000	2,600,000,000
Residential mortgage \| Prime / Alt-A & option ARMs
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Total assets held by securitization VIEs	55,451,000,000	55,362,000,000
Residential mortgage \| Subprime
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Total assets held by securitization VIEs	9,515,000,000	9,709,000,000
Commercial and other
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Total assets held by securitization VIEs	163,184,000,000	164,915,000,000
Commercial and other \| Investment-grade
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Fair value of retained interests	5,800,000,000	5,800,000,000
Commercial and other \| Noninvestment-grade
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Fair value of retained interests	1,100,000,000	1,100,000,000
VIEs consolidated by the Firm
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in consolidated securitization VIEs	735,000,000	754,000,000
VIEs consolidated by the Firm \| Residential mortgage \| Prime / Alt-A & option ARMs
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in consolidated securitization VIEs	735,000,000	754,000,000
VIEs consolidated by the Firm \| Residential mortgage \| Subprime
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in consolidated securitization VIEs	0	0
VIEs consolidated by the Firm \| Commercial and other
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in consolidated securitization VIEs	0	0
Nonconsolidated entities
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in nonconsolidated securitization VIEs with continuing involvement	165,731,000,000	165,838,000,000
Interest in securitized assets in nonconsolidated VIEs	9,670,000,000	9,603,000,000
Nonconsolidated entities \| Trading assets
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	1,650,000,000	1,642,000,000
Nonconsolidated entities \| Investment securities
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	7,357,000,000	7,291,000,000
Nonconsolidated entities \| Other financial assets
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	663,000,000	670,000,000
Nonconsolidated entities \| Residential mortgage \| Prime / Alt-A & option ARMs
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in nonconsolidated securitization VIEs with continuing involvement	37,836,000,000	37,058,000,000
Interest in securitized assets in nonconsolidated VIEs	2,798,000,000	2,662,000,000
Nonconsolidated entities \| Residential mortgage \| Subprime
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in nonconsolidated securitization VIEs with continuing involvement	1,701,000,000	1,743,000,000
Interest in securitized assets in nonconsolidated VIEs	16,000,000	10,000,000
Nonconsolidated entities \| Residential mortgage \| Trading assets \| Prime / Alt-A & option ARMs
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	839,000,000	744,000,000
Nonconsolidated entities \| Residential mortgage \| Trading assets \| Subprime
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	16,000,000	10,000,000
Nonconsolidated entities \| Residential mortgage \| Investment securities \| Prime / Alt-A & option ARMs
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	1,959,000,000	1,918,000,000
Nonconsolidated entities \| Residential mortgage \| Investment securities \| Subprime
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	0	0
Nonconsolidated entities \| Residential mortgage \| Other financial assets \| Prime / Alt-A & option ARMs
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	0	0
Nonconsolidated entities \| Residential mortgage \| Other financial assets \| Subprime
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	0	0
Nonconsolidated entities \| Commercial and other
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in nonconsolidated securitization VIEs with continuing involvement	126,194,000,000	127,037,000,000
Interest in securitized assets in nonconsolidated VIEs	6,856,000,000	6,931,000,000
Nonconsolidated entities \| Commercial and other \| Trading assets
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	795,000,000	888,000,000
Nonconsolidated entities \| Commercial and other \| Investment securities
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	5,398,000,000	5,373,000,000
Nonconsolidated entities \| Commercial and other \| Other financial assets
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	$ 663,000,000	$ 670,000,000

Firm-sponsored mortgage and other consumer securitization trusts.

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- Definition

Percent of retained securitization interests rated A or better.

+ References

No definition available.

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- Definition

Senior securities purchased in connection with IB secondary market making activities. These securities are excluded from entity interest in securitized assets in nonconsolidated VIEs.

+ References

No definition available.

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- Definition

Subordinated securities purchased in connection with IB secondary market making Activities. These securities are excluded from entity interest in securitized assets in nonconsolidated VIEs.

+ References

No definition available.

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- Definition

Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
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- Definition

Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that have been derecognized. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(2)
-URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

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- Definition

The carrying amount (fair value) as of the balance sheet date of the transferor's interests in transferred financial assets (typically securitized receivables, generally not involved in the collection of principal) following transfer of significant portions of such financial instruments to other parties. Such interests could be ancillary cash flows and interest-only strips.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(3)
-URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

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