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Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 191,634 $ 134,407
Agreements to resell [1] 38,384 27,988
Customer margin assets 106,238 87,809
Total collateralized transactions 336,256 250,204
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 18,465 8,342
Agreements to resell [1] 38,362 26,678
Customer margin assets 35,104 21,465
Total collateralized transactions $ 91,931 $ 56,485
[1] As of September 30, 2025 and December 31, 2024, the Company had $30.1 billion and $21.4 billion, respectively, of securities purchased under agreements to resell, and $2.5 billion and $0, respectively, of securities borrowed that were segregated to satisfy regulatory requirements. These securities are included in “Securities - segregated for regulatory purposes” in the condensed consolidated statements of financial condition.