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Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 55,396 $ 69,582
Agreements to resell [1] 30,730 14,715
Customer margin assets 44,658 65,899
Total collateralized transactions 130,784 150,196
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 6,197 6,192
Agreements to resell [1] 29,742 13,956
Customer margin assets 14,104 15,936
Total collateralized transactions $ 50,043 $ 36,084
[1] As of September 30, 2022, $26.0 billion or 87% (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.