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Fair Value Measurements - Summary of Level 3 Financial Assets (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total financial assets at fair value | $ 965,610 | $ 967,846 | $ 907,669
Investments at fair value | 129,176 |  | 104,742
Loans at fair value | 5,498 |  | 5,460
Other assets at fair value | 190 |  | 194
Derivatives |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total financial assets at fair value | 100,340 |  | 96,387
Level 3 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total financial assets at fair value | 21,781 | 21,117 | 20,358
Loans at fair value | 671 | 681 | 683
Other assets at fair value | 190 |  | 194
Level 3 | Trading cash instruments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Trading cash instrument at fair value | 1,085 | 883 | 1,213
Level 3 | Derivatives |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total financial assets at fair value | 4,833 | 4,751 | 4,126
Level 3 | Investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investments at fair value | 15,002 | 14,604 | 14,142
Level 3 | Other assets |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other assets at fair value | $ 190 | $ 198 | $ 194

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