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Fair Value Measurements - Summary of Financial Assets and Liabilities Carried at Fair Value (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
Total assets $ 1,807,982 $ 1,785,009 $ 1,675,972
Total level 3 financial assets divided by total assets 1.20% 1.20% 1.20%
Total level 3 financial assets divided by total financial assets at fair value 2.30% 2.20% 2.20%
Total financial liabilities at fair value $ 771,744 $ 752,738 $ 699,661
Total liabilities $ 1,683,580 $ 1,660,913 $ 1,553,976
Total level 3 financial liabilities divided by total liabilities 1.80% 1.80% 1.70%
Total level 3 financial liabilities divided by total financial liabilities at fair value 4.00% 3.90% 3.70%
Counterparty and cash collateral netting      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total financial assets at fair value $ (48,075) $ (51,066) $ (49,048)
Total financial liabilities at fair value (43,723) (39,223) (37,750)
Investments in funds at NAV      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total financial assets at fair value 1,946 2,021 2,547
Level 1      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [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      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [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      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [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