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Commitments, Contingencies and Guarantees (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Commitments and Contingencies Disclosure [Line Items]      
Financial guarantees obtained $ 13,000,000 $ 13,000,000  
Margin deposits contributed to Cantor Fitzgerald $ 20,000,000    
Contingent future issuance of common stock (in shares) 360,571 358,840 364,277
eSpeed      
Commitments and Contingencies Disclosure [Line Items]      
Contingent future issuance of common stock (in shares) 992,247    
Revenue required to trigger annual issuance of Nasdaq common stock $ 25,000,000    
Property Lease Guarantee      
Commitments and Contingencies Disclosure [Line Items]      
Other guarantees 3,000,000 $ 11,000,000  
Escrow Agreement      
Commitments and Contingencies Disclosure [Line Items]      
Contingency, accrual 31,000,000    
Clearinghouse Credit Facilities      
Commitments and Contingencies Disclosure [Line Items]      
Credit facility, available liquidity $ 170,000,000 $ 202,000,000