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Commitments, Contingencies and Guarantees (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Commitments and Contingencies Disclosure [Line Items] |  |
Financial guarantees obtained | $ 12,000,000 | $ 13,000,000
Margin deposits contributed to Cantor Fitzgerald | $ 19,000,000 |
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 | 3,000,000
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 | $ 172,000,000 | $ 170,000,000

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