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Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 97,210 $ 62,689
Agreements to resell [1] 35,198 33,208
Customer margin assets 54,847 42,222
Total collateralized transactions 187,255 138,119
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 8,437 7,055
Agreements to resell [1] 34,825 31,108
Customer margin assets 17,234 17,008
Total collateralized transactions $ 60,496 $ 55,171
[1] As of December 31, 2023, $29.6 billion or 85% (as of December 31, 2022, $27.1 billion or 87%) 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.