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Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 13,768 $ 12,131
Agreements to resell [1] 11,117 757
Customer margin assets 17,773 14,905
Total collateralized transactions 42,658 27,793
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 3,621 2,229
Agreements to resell [1] 11,117 743
Customer margin assets 7,172 6,279
Total collateralized transactions $ 21,910 $ 9,251
[1] As of December 31, 2016, $11.0 billion or 99% (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.