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Commitments, Contingencies and Guarantees (Details) - USD ($) | 12 Months Ended
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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 |

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