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Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 65,841 $ 64,436
Agreements to resell [1] 16,570 23,859
Customer margin assets 60,259 47,609
Total collateralized transactions 142,670 135,904
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 6,334 4,859
Agreements to resell [1] 14,820 23,832
Customer margin assets 14,682 14,182
Total collateralized transactions $ 35,836 $ 42,873
[1] As of September 30, 2021, $10.5 billion or 71% (as of December 31, 2020, $23.1 billion or 97%) 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.