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Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 135,963 $ 134,407
Agreements to resell [1] 31,145 27,988
Customer margin assets 81,753 87,809
Total collateralized transactions 248,861 250,204
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 9,580 8,342
Agreements to resell [1] 28,782 26,678
Customer margin assets 21,059 21,465
Total collateralized transactions $ 59,421 $ 56,485
[1] As of March 31, 2025, $22.9 billion or 79% (as of December 31, 2024, $21.4 billion or 80%) of securities purchased under agreements to resell were segregated to satisfy regulatory requirements and are included in “Securities – segregated for regulatory purposes” in the condensed consolidated statements of financial condition.