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Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 26,764 $ 31,994
Agreements to resell [1] 27,886 17,185
Customer margin assets 20,989 34,156
Total collateralized transactions 75,639 83,335
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 3,636 3,944
Agreements to resell [1] 27,886 16,627
Customer margin assets 6,531 11,189
Total collateralized transactions $ 38,053 $ 31,760
[1] As of March 31, 2020, $27.0 billion or 97% (as of December 31, 2019, $14.0 billion or 84%) 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.