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Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 21,412 $ 23,662
Agreements to resell [1] 12,672 11,231
Customer margin assets 25,778 30,236
Total collateralized transactions 59,862 65,129
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 3,284 3,041
Agreements to resell [1] 11,881 11,231
Customer margin assets 6,616 9,013
Total collateralized transactions $ 21,781 $ 23,285
[1] As of December 31, 2018, $11.4 billion or 96% (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.