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Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 107,930 $ 97,210
Agreements to resell [1] 30,129 35,198
Customer margin assets 64,002 54,847
Total collateralized transactions 202,061 187,255
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 9,292 8,437
Agreements to resell [1] 29,065 34,825
Customer margin assets 24,666 17,234
Total collateralized transactions $ 63,023 $ 60,496
[1] As of March 31, 2024, $23.3 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 condensed consolidated statements of financial condition.