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Performance Bonds and Guaranty Fund Contributions (Details)
$ in Billions
9 Months Ended
Sep. 30, 2019
USD ($)
Guarantor Obligations [Line Items]  
Average Daily Clearing Settlement $ 3.5
Federal Reserve Reinvestment [Member]  
Guarantor Obligations [Line Items]  
Cash Equivalents, at Carrying Value 26.0
U.S. Treasury Performance Bond [Member]  
Guarantor Obligations [Line Items]  
Available-for-sale Securities, Amortized Cost Basis 1.4
Available-for-sale Securities at Fair Value 1.4
U.S. Government Agency Security Performance Bond [Member]  
Guarantor Obligations [Line Items]  
Available-for-sale Securities, Amortized Cost Basis 0.5
Available-for-sale Securities at Fair Value $ 0.5