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Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 56,803 $ 69,582
Agreements to resell [1] 29,639 14,715
Customer margin assets 46,145 65,899
Total collateralized transactions 132,587 150,196
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 6,403 6,192
Agreements to resell [1] 28,192 13,956
Customer margin assets 13,968 15,936
Total collateralized transactions $ 48,563 $ 36,084
[1] As of June 30, 2022, $23.3 billion or 83% (as of December 31, 2021, $10.4 billion or 74%) of securities acquired through agreements to resell that are shown as repledged have been deposited in a separate bank account for the exclusive benefit of customers in accordance with SEC Rule 15c3-3.