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Fair Value Hierarchy - Fair Value of Derivatives by Level (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Derivative [Line Items]      
Total financial assets at fair value $ 965,610 $ 967,846 $ 907,669
Total financial liabilities at fair value (771,744) (752,738) (699,661)
Fair value included in financial instruments (261,830)   (202,555)
Level 1      
Derivative [Line Items]      
Total financial assets at fair value 516,317 494,481 436,298
Total financial liabilities at fair value (145,974) (146,888) (100,350)
Level 2      
Derivative [Line Items]      
Total financial assets at fair value 473,641 501,293 497,514
Total financial liabilities at fair value (638,542) (615,425) (611,340)
Level 3      
Derivative [Line Items]      
Total financial assets at fair value 21,781 21,117 20,358
Total financial liabilities at fair value (30,951) (29,648) (25,721)
Derivatives      
Derivative [Line Items]      
Total financial assets at fair value 100,340   96,387
Fair value included in financial instruments 52,265   47,339
Total financial liabilities at fair value (123,268)   (112,730)
Fair value included in financial instruments (79,545)   (74,980)
Derivatives | Gross fair value      
Derivative [Line Items]      
Total financial assets at fair value 372,860   376,352
Total financial liabilities at fair value (395,788)   (392,695)
Derivatives | Interest rates      
Derivative [Line Items]      
Total financial assets at fair value 158,187   156,736
Total financial liabilities at fair value (119,905)   (125,019)
Derivatives | Credit      
Derivative [Line Items]      
Total financial assets at fair value 14,037   11,437
Total financial liabilities at fair value (14,400)   (10,030)
Derivatives | Currencies      
Derivative [Line Items]      
Total financial assets at fair value 76,727   114,674
Total financial liabilities at fair value (76,930)   (114,615)
Derivatives | Commodities      
Derivative [Line Items]      
Total financial assets at fair value 13,184   13,326
Total financial liabilities at fair value (15,401)   (14,525)
Derivatives | Equities      
Derivative [Line Items]      
Total financial assets at fair value 110,725   80,179
Total financial liabilities at fair value (169,152)   (128,506)
Derivatives | Counterparty netting in levels      
Derivative [Line Items]      
Total financial assets at fair value (272,520)   (279,965)
Total financial liabilities at fair value 272,520   279,965
Derivatives | Cross-level counterparty netting      
Derivative [Line Items]      
Total financial assets at fair value (908)   (947)
Total financial liabilities at fair value 908   947
Derivatives | Cash collateral netting      
Derivative [Line Items]      
Cash collateral netting (47,167)   (48,101)
Cash collateral netting 42,815   36,803
Derivatives | Level 1      
Derivative [Line Items]      
Total financial assets at fair value 24   238
Total financial liabilities at fair value (76)   (100)
Derivatives | Level 1 | Gross fair value      
Derivative [Line Items]      
Total financial assets at fair value 24   238
Total financial liabilities at fair value (76)   (100)
Derivatives | Level 1 | Interest rates      
Derivative [Line Items]      
Total financial assets at fair value 3   102
Total financial liabilities at fair value (57)   (92)
Derivatives | Level 1 | Credit      
Derivative [Line Items]      
Total financial assets at fair value 0   0
Total financial liabilities at fair value 0   0
Derivatives | Level 1 | Currencies      
Derivative [Line Items]      
Total financial assets at fair value 0   0
Total financial liabilities at fair value 0   0
Derivatives | Level 1 | Commodities      
Derivative [Line Items]      
Total financial assets at fair value 0   0
Total financial liabilities at fair value 0   0
Derivatives | Level 1 | Equities      
Derivative [Line Items]      
Total financial assets at fair value 21   136
Total financial liabilities at fair value (19)   (8)
Derivatives | Level 1 | Counterparty netting in levels      
Derivative [Line Items]      
Total financial assets at fair value 0   0
Total financial liabilities at fair value 0   0
Derivatives | Level 2      
Derivative [Line Items]      
Total financial assets at fair value 95,483   92,023
Total financial liabilities at fair value (118,755)   (109,329)
Derivatives | Level 2 | Gross fair value      
Derivative [Line Items]      
Total financial assets at fair value 367,153   371,238
Total financial liabilities at fair value (390,425)   (388,544)
Derivatives | Level 2 | Interest rates      
Derivative [Line Items]      
Total financial assets at fair value 157,396   156,054
Total financial liabilities at fair value (119,220)   (124,235)
Derivatives | Level 2 | Credit      
Derivative [Line Items]      
Total financial assets at fair value 11,640   9,249
Total financial liabilities at fair value (13,367)   (9,060)
Derivatives | Level 2 | Currencies      
Derivative [Line Items]      
Total financial assets at fair value 76,545   114,500
Total financial liabilities at fair value (76,861)   (114,488)
Derivatives | Level 2 | Commodities      
Derivative [Line Items]      
Total financial assets at fair value 11,888   12,134
Total financial liabilities at fair value (14,858)   (14,111)
Derivatives | Level 2 | Equities      
Derivative [Line Items]      
Total financial assets at fair value 109,684   79,301
Total financial liabilities at fair value (166,119)   (126,650)
Derivatives | Level 2 | Counterparty netting in levels      
Derivative [Line Items]      
Total financial assets at fair value (271,670)   (279,215)
Total financial liabilities at fair value 271,670   279,215
Derivatives | Level 3      
Derivative [Line Items]      
Total financial assets at fair value 4,833 $ 4,751 4,126
Total financial liabilities at fair value (4,437)   (3,301)
Derivatives | Level 3 | Gross fair value      
Derivative [Line Items]      
Total financial assets at fair value 5,683   4,876
Total financial liabilities at fair value (5,287)   (4,051)
Derivatives | Level 3 | Interest rates      
Derivative [Line Items]      
Total financial assets at fair value 788   580
Total financial liabilities at fair value (628)   (692)
Derivatives | Level 3 | Credit      
Derivative [Line Items]      
Total financial assets at fair value 2,397   2,188
Total financial liabilities at fair value (1,033)   (970)
Derivatives | Level 3 | Currencies      
Derivative [Line Items]      
Total financial assets at fair value 182   174
Total financial liabilities at fair value (69)   (127)
Derivatives | Level 3 | Commodities      
Derivative [Line Items]      
Total financial assets at fair value 1,296   1,192
Total financial liabilities at fair value (543)   (414)
Derivatives | Level 3 | Equities      
Derivative [Line Items]      
Total financial assets at fair value 1,020   742
Total financial liabilities at fair value (3,014)   (1,848)
Derivatives | Level 3 | Counterparty netting in levels      
Derivative [Line Items]      
Total financial assets at fair value (850)   (750)
Total financial liabilities at fair value $ 850   $ 750