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Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 28,591 $ 21,412
Agreements to resell [1] 18,885 12,672
Customer margin assets 26,060 25,778
Total collateralized transactions 73,536 59,862
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 4,078 3,284
Agreements to resell [1] 18,081 11,881
Customer margin assets 9,707 6,616
Total collateralized transactions $ 31,866 $ 21,781
[1] As of September 30, 2019, $17.5 billion or 97% (as of December 31, 2018, $11.4 billion or 96%) 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.