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Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 23,662 $ 13,768
Agreements to resell [1] 11,231 11,117
Customer margin assets 30,236 17,773
Total collateralized transactions 65,129 42,658
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 3,041 3,621
Agreements to resell [1] 11,231 11,117
Customer margin assets 9,013 7,172
Total collateralized transactions $ 23,285 $ 21,910
[1] As of December 31, 2017, $9.2 billion or 82% (as of December 31, 2016, $11.0 billion or 99%) 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.