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Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 11,809 $ 12,131
Agreements to resell [1] 4,724 757
Customer margin assets 13,806 14,905
Total collateralized transactions 30,339 27,793
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 3,743 2,229
Agreements to resell [1] 4,724 743
Customer margin assets 6,989 6,279
Total collateralized transactions $ 15,456 $ 9,251
[1] As of June 30, 2016, $4.6 billion or 98% (as of December 31, 2015, $0.6 billion or 76%) 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.