Variable Interest Entities - Firm Sponsored VIEs (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Total assets held by securitization VIEs	$ 318,655	$ 306,687
Subordinated securities purchased in connection with CIB's secondary market-making activities	$ 250	$ 56
Retained securitization interests, risk-rated 'A' or better, at fair value	72.00%	74.00%
Commercial & Investment Bank
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Senior securities purchased in connection with CIB's secondary market-making activities	$ 4,200	$ 188
Residential mortgage \| Investment-grade
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Fair value of retained interests	3,400	3,500
Residential mortgage \| Noninvestment-grade
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Fair value of retained interests	591	525
Residential mortgage \| Prime / Alt-A & option ARMs
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Total assets held by securitization VIEs	85,597	83,442
Residential mortgage \| Subprime
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Total assets held by securitization VIEs	16,957	10,690
Commercial and other
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Total assets held by securitization VIEs	216,101	212,555
Commercial and other \| Investment-grade
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Fair value of retained interests	5,500	6,200
Commercial and other \| Noninvestment-grade
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Fair value of retained interests	1,200	1,100
VIEs consolidated by the Firm
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in consolidated securitization VIEs	681	718
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	534	548
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	147	170
Nonconsolidated entities
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in nonconsolidated securitization VIEs with continuing involvement	209,599	200,277
Interest in securitized assets in nonconsolidated VIEs	10,888	11,474
Nonconsolidated entities \| Trading assets
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	1,774	2,029
Nonconsolidated entities \| Investment securities
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	6,850	7,096
Nonconsolidated entities \| Other financial assets
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	2,264	2,349
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	57,838	58,525
Interest in securitized assets in nonconsolidated VIEs	3,942	4,032
Nonconsolidated entities \| Residential mortgage \| Subprime
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Assets held in nonconsolidated securitization VIEs with continuing involvement	4,329	2,766
Interest in securitized assets in nonconsolidated VIEs	157	112
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	721	707
Nonconsolidated entities \| Residential mortgage \| Trading assets \| Subprime
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	146	100
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	1,758	1,799
Nonconsolidated entities \| Residential mortgage \| Investment securities \| Subprime
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	11	12
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	1,463	1,526
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	147,432	138,986
Interest in securitized assets in nonconsolidated VIEs	6,789	7,330
Nonconsolidated entities \| Commercial and other \| Trading assets
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	907	1,222
Nonconsolidated entities \| Commercial and other \| Investment securities
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	5,081	5,285
Nonconsolidated entities \| Commercial and other \| Other financial assets
Firm sponsored mortgage and other consumer securitization trusts [Abstract]
Interest in securitized assets in nonconsolidated VIEs	$ 801	$ 823

Firm-sponsored mortgage and other consumer securitization trusts.

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- Definition

Percent of retained securitization interests rated A or better.

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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

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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

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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

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Fair value portion of interest continued to be held by a transferor after transferring financial assets to a third party.

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