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Derivatives and Hedging Activities - Fair Value of Derivatives on a Gross Basis (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Derivative [Line Items]    
Derivative assets, before offset $ 372,860 $ 376,352
Derivative liabilities, before offset 395,788 392,695
Derivative assets, offset amounts (320,595) (329,013)
Derivative liabilities, offset amounts (316,243) (317,715)
Derivative Assets 52,265 47,339
Derivative Liabilities 79,545 74,980
Cash collateral received (714) (600)
Cash collateral posted (1,442) (1,271)
Securities collateral received (19,363) (14,938)
Securities collateral posted (10,321) (8,731)
Total 32,188 31,801
Total 67,782 64,978
Notional amount 46,956,210 37,127,322
Counterparty netting    
Derivative [Line Items]    
Derivative assets, offset amounts (273,428) (280,912)
Derivative liabilities, offset amounts (273,428) (280,912)
Cash collateral netting    
Derivative [Line Items]    
Derivative assets, offset amounts (47,167) (48,101)
Derivative liabilities, offset amounts (42,815) (36,803)
Not accounted for as hedges    
Derivative [Line Items]    
Derivative assets, before offset 372,674 375,782
Derivative liabilities, before offset 395,491 392,679
Notional amount 46,643,262 36,861,600
Not accounted for as hedges | Interest rates    
Derivative [Line Items]    
Derivative assets, before offset 158,007 156,535
Derivative liabilities, before offset 119,897 125,011
Notional amount 31,750,994 25,473,308
Not accounted for as hedges | Credit    
Derivative [Line Items]    
Derivative assets, before offset 14,037 11,437
Derivative liabilities, before offset 14,400 10,030
Notional amount 1,956,184 1,279,571
Not accounted for as hedges | Currencies    
Derivative [Line Items]    
Derivative assets, before offset 76,721 114,305
Derivative liabilities, before offset 76,641 114,607
Notional amount 8,346,321 6,471,066
Not accounted for as hedges | Commodities    
Derivative [Line Items]    
Derivative assets, before offset 13,184 13,326
Derivative liabilities, before offset 15,401 14,525
Notional amount 570,090 510,420
Not accounted for as hedges | Equities    
Derivative [Line Items]    
Derivative assets, before offset 110,725 80,179
Derivative liabilities, before offset 169,152 128,506
Notional amount 4,019,673 3,127,235
Accounted for as hedges    
Derivative [Line Items]    
Derivative assets, before offset 186 570
Derivative liabilities, before offset 297 16
Notional amount 312,948 265,722
Accounted for as hedges | Interest rates    
Derivative [Line Items]    
Derivative assets, before offset 180 201
Derivative liabilities, before offset 8 8
Notional amount 290,347 250,353
Accounted for as hedges | Currencies    
Derivative [Line Items]    
Derivative assets, before offset 6 369
Derivative liabilities, before offset 289 8
Notional amount 22,601 15,369
Exchange-traded    
Derivative [Line Items]    
Derivative Assets 7,717 5,684
Derivative Liabilities 39,230 32,690
Exchange-traded | Counterparty netting    
Derivative [Line Items]    
Derivative assets, offset amounts (73,913) (57,776)
Derivative liabilities, offset amounts (73,913) (57,776)
Exchange-traded | Not accounted for as hedges | Interest rates    
Derivative [Line Items]    
Derivative assets, before offset 3,755 2,706
Derivative liabilities, before offset 1,923 1,068
Notional amount 2,102,243 2,332,117
Exchange-traded | Not accounted for as hedges | Credit    
Derivative [Line Items]    
Notional amount 108 322
Exchange-traded | Not accounted for as hedges | Currencies    
Derivative [Line Items]    
Derivative assets, before offset 114 142
Derivative liabilities, before offset 28 6
Notional amount 10,968 9,264
Exchange-traded | Not accounted for as hedges | Commodities    
Derivative [Line Items]    
Derivative assets, before offset 6,127 5,563
Derivative liabilities, before offset 6,253 5,917
Notional amount 373,175 324,159
Exchange-traded | Not accounted for as hedges | Equities    
Derivative [Line Items]    
Derivative assets, before offset 71,634 55,049
Derivative liabilities, before offset 104,939 83,475
Notional amount 2,408,560 1,868,855
OTC-cleared    
Derivative [Line Items]    
Derivative Assets 63 440
Derivative Liabilities 202 1,126
OTC-cleared | Counterparty netting    
Derivative [Line Items]    
Derivative assets, offset amounts (5,492) (4,867)
Derivative liabilities, offset amounts (5,492) (4,867)
OTC-cleared | Cash collateral netting    
Derivative [Line Items]    
Derivative assets, offset amounts (56) (412)
Derivative liabilities, offset amounts (495) (105)
OTC-cleared | Not accounted for as hedges | Interest rates    
Derivative [Line Items]    
Derivative assets, before offset 1,171 1,746
Derivative liabilities, before offset 1,369 2,428
Notional amount 18,934,073 12,571,690
OTC-cleared | Not accounted for as hedges | Credit    
Derivative [Line Items]    
Derivative assets, before offset 3,367 1,787
Derivative liabilities, before offset 3,411 1,893
Notional amount 1,137,889 660,181
OTC-cleared | Not accounted for as hedges | Currencies    
Derivative [Line Items]    
Derivative assets, before offset 534 1,325
Derivative liabilities, before offset 592 993
Notional amount 567,994 429,858
OTC-cleared | Not accounted for as hedges | Commodities    
Derivative [Line Items]    
Derivative assets, before offset 504 558
Derivative liabilities, before offset 693 650
Notional amount 2,765 3,087
OTC-cleared | Not accounted for as hedges | Equities    
Derivative [Line Items]    
Derivative assets, before offset 32 189
Derivative liabilities, before offset 50 131
Notional amount 1,223 1,475
OTC-cleared | Accounted for as hedges | Interest rates    
Derivative [Line Items]    
Derivative assets, before offset 0 0
Derivative liabilities, before offset 1 0
Notional amount 287,753 246,765
OTC-cleared | Accounted for as hedges | Currencies    
Derivative [Line Items]    
Derivative assets, before offset 3 114
Derivative liabilities, before offset 73 3
Notional amount 5,627 5,041
Bilateral OTC    
Derivative [Line Items]    
Derivative Assets 44,485 41,215
Derivative Liabilities 40,113 41,164
Bilateral OTC | Counterparty netting    
Derivative [Line Items]    
Derivative assets, offset amounts (194,023) (218,269)
Derivative liabilities, offset amounts (194,023) (218,269)
Bilateral OTC | Cash collateral netting    
Derivative [Line Items]    
Derivative assets, offset amounts (47,111) (47,689)
Derivative liabilities, offset amounts (42,320) (36,698)
Bilateral OTC | Not accounted for as hedges | Interest rates    
Derivative [Line Items]    
Derivative assets, before offset 153,081 152,083
Derivative liabilities, before offset 116,605 121,515
Notional amount 10,714,678 10,569,501
Bilateral OTC | Not accounted for as hedges | Credit    
Derivative [Line Items]    
Derivative assets, before offset 10,670 9,650
Derivative liabilities, before offset 10,989 8,137
Notional amount 818,187 619,068
Bilateral OTC | Not accounted for as hedges | Currencies    
Derivative [Line Items]    
Derivative assets, before offset 76,073 112,838
Derivative liabilities, before offset 76,021 113,608
Notional amount 7,767,359 6,031,944
Bilateral OTC | Not accounted for as hedges | Commodities    
Derivative [Line Items]    
Derivative assets, before offset 6,553 7,205
Derivative liabilities, before offset 8,455 7,958
Notional amount 194,150 183,174
Bilateral OTC | Not accounted for as hedges | Equities    
Derivative [Line Items]    
Derivative assets, before offset 39,059 24,941
Derivative liabilities, before offset 64,163 44,900
Notional amount 1,609,890 1,256,905
Bilateral OTC | Accounted for as hedges | Interest rates    
Derivative [Line Items]    
Derivative assets, before offset 180 201
Derivative liabilities, before offset 7 8
Notional amount 2,594 3,588
Bilateral OTC | Accounted for as hedges | Currencies    
Derivative [Line Items]    
Derivative assets, before offset 3 255
Derivative liabilities, before offset 216 5
Notional amount $ 16,974 $ 10,328