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Clearing Operations (Schedule of Clearing Member Default Fund Contributions And Margin Deposits) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Clearing Operations [Line Items]  
Default fund contributions $ 403
Margin deposits 6,700
Total 7,103
Cash Contributions  
Clearing Operations [Line Items]  
Default fund contributions 314
Margin deposits 2,987
Total 3,301
Non-Cash Contributions  
Clearing Operations [Line Items]  
Default fund contributions 89
Margin deposits 3,713
Total $ 3,802