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Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 27,321 $ 21,412
Agreements to resell [1] 16,269 12,672
Customer margin assets 27,308 25,778
Total collateralized transactions 70,898 59,862
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 4,179 3,284
Agreements to resell [1] 15,158 11,881
Customer margin assets 9,529 6,616
Total collateralized transactions $ 28,866 $ 21,781
[1] As of March 31, 2019, $14.6 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.