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Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 66,861 $ 69,582
Agreements to resell [1] 23,175 14,715
Customer margin assets 55,656 65,899
Total collateralized transactions 145,692 150,196
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 7,063 6,192
Agreements to resell [1] 21,946 13,956
Customer margin assets 15,685 15,936
Total collateralized transactions $ 44,694 $ 36,084
[1] As of March 31, 2022, $16.9 billion or 77% (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.