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Variable Interest Entities - Firm Sponsored VIEs (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Firm sponsored mortgage and other consumer securitization trusts [Abstract]    
Total assets held by securitization VIEs $ 238,304 $ 235,493
Retained securitization interests, risk-rated 'A' or better, at fair value 77.00% 77.00%
Corporate & Investment Bank    
Firm sponsored mortgage and other consumer securitization trusts [Abstract]    
Senior securities purchased in connection with CIB's secondary market-making activities $ 134 $ 52
Subordinated securities purchased in connection with CIB's secondary market-making activities 119 38
Residential mortgage | Investment-grade    
Firm sponsored mortgage and other consumer securitization trusts [Abstract]    
Fair value of retained interests 2,400 2,500
Residential mortgage | Noninvestment-grade    
Firm sponsored mortgage and other consumer securitization trusts [Abstract]    
Fair value of retained interests 115 88
Residential mortgage | Prime / Alt-A & option ARMs    
Firm sponsored mortgage and other consumer securitization trusts [Abstract]    
Total assets held by securitization VIEs 61,900 58,570
Residential mortgage | Subprime    
Firm sponsored mortgage and other consumer securitization trusts [Abstract]    
Total assets held by securitization VIEs 8,999 8,881
Commercial and other    
Firm sponsored mortgage and other consumer securitization trusts [Abstract]    
Total assets held by securitization VIEs 167,405 168,042
Commercial and other | Investment-grade    
Firm sponsored mortgage and other consumer securitization trusts [Abstract]    
Fair value of retained interests 5,800 6,100
Commercial and other | Noninvestment-grade    
Firm sponsored mortgage and other consumer securitization trusts [Abstract]    
Fair value of retained interests 1,700 1,700
VIEs consolidated by the Firm    
Firm sponsored mortgage and other consumer securitization trusts [Abstract]    
Assets held in consolidated securitization VIEs 665 675
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 665 675
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 159,293 160,893
Interest in securitized assets in nonconsolidated VIEs 10,098 10,462
Nonconsolidated entities | Trading assets    
Firm sponsored mortgage and other consumer securitization trusts [Abstract]    
Interest in securitized assets in nonconsolidated VIEs 1,087 1,429
Nonconsolidated entities | Investment securities    
Firm sponsored mortgage and other consumer securitization trusts [Abstract]    
Interest in securitized assets in nonconsolidated VIEs 7,530 7,619
Nonconsolidated entities | Other financial assets    
Firm sponsored mortgage and other consumer securitization trusts [Abstract]    
Interest in securitized assets in nonconsolidated VIEs 1,481 1,414
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 41,639 39,319
Interest in securitized assets in nonconsolidated VIEs 2,530 2,636
Nonconsolidated entities | Residential mortgage | Subprime    
Firm sponsored mortgage and other consumer securitization trusts [Abstract]    
Assets held in nonconsolidated securitization VIEs with continuing involvement 1,600 1,312
Interest in securitized assets in nonconsolidated VIEs 43 3
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 547 595
Nonconsolidated entities | Residential mortgage | Trading assets | Subprime    
Firm sponsored mortgage and other consumer securitization trusts [Abstract]    
Interest in securitized assets in nonconsolidated VIEs 20 3
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 1,900 1,981
Nonconsolidated entities | Residential mortgage | Investment securities | Subprime    
Firm sponsored mortgage and other consumer securitization trusts [Abstract]    
Interest in securitized assets in nonconsolidated VIEs 23 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 83 60
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 116,054 120,262
Interest in securitized assets in nonconsolidated VIEs 7,525 7,823
Nonconsolidated entities | Commercial and other | Trading assets    
Firm sponsored mortgage and other consumer securitization trusts [Abstract]    
Interest in securitized assets in nonconsolidated VIEs 520 831
Nonconsolidated entities | Commercial and other | Investment securities    
Firm sponsored mortgage and other consumer securitization trusts [Abstract]    
Interest in securitized assets in nonconsolidated VIEs 5,607 5,638
Nonconsolidated entities | Commercial and other | Other financial assets    
Firm sponsored mortgage and other consumer securitization trusts [Abstract]    
Interest in securitized assets in nonconsolidated VIEs $ 1,398 $ 1,354