XML 59 R48.htm IDEA: XBRL DOCUMENT v3.8.0.1
Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Permitted To Repledge [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions $ 23,556 $ 23,662
Agreements to resell [1] 8,976 11,231
Customer margin assets 29,412 30,236
Total collateralized transactions 61,944 65,129
Sold Or Repledged [Member]    
Collateralized Transactions [Line Items]    
Securities lending transactions 3,346 3,041
Agreements to resell [1] 8,976 11,231
Customer margin assets 7,520 9,013
Total collateralized transactions $ 19,842 $ 23,285
[1] As of March 31, 2018, $8.3 billion or 92% (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.