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Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 134,407 $ 97,210
Agreements to resell [1] 27,988 35,198
Customer margin assets 87,809 54,847
Total collateralized transactions 250,204 187,255
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 8,342 8,437
Agreements to resell [1] 26,678 34,825
Customer margin assets 21,465 17,234
Total collateralized transactions $ 56,485 $ 60,496
[1] As of December 31, 2024, $21.4 billion or 80% (as of December 31, 2023, $29.6 billion or 85%) of securities purchased under agreements to resell were segregated to satisfy regulatory requirements and are included in “Securities - segregated for regulatory purposes” in the consolidated statements of financial condition.