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Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 24,153 $ 23,662
Agreements to resell [1] 9,066 11,231
Customer margin assets 32,556 30,236
Total collateralized transactions 65,775 65,129
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 3,588 3,041
Agreements to resell [1] 8,965 11,231
Customer margin assets 8,902 9,013
Total collateralized transactions $ 21,455 $ 23,285
[1] As of September 30, 2018, $8.7 billion or 97% (as of December 31, 2017, $9.2 billion or 82%) 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.