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Commitments, Contingencies and Guarantees (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 02, 2014 exchange | Sep. 30, 2018 kr / shares | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) shares | Sep. 30, 2018 USD ($) | Sep. 13, 2018 kr / $ | Dec. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Financial guarantees obtained |  |  |  |  |  | $ 12,000,000 |  | $ 14,000,000
SEK exchange rate | kr / $ |  |  |  |  |  |  | 8.96 |
National exchanges named as defendants | exchange | 7 |  |  |  |  |  |  |
eSpeed |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Contingent future issuance of common stock (in shares) | 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 |  |  |  |  |  | 4,000,000 |  | 3,000,000
Escrow Agreement |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Contingency, accrual |  |  |  |  |  | 11,000,000 |  |
Escrow Agreement | Other current liabilities |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Contingency, accrual |  |  |  |  |  | 9,000,000 |  |
Escrow Agreement | Other non-current liabilities |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Contingency, accrual |  |  |  |  |  | 2,000,000 |  |
Clearinghouse Credit Facilities |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Credit facility, available liquidity |  |  |  |  |  | 219,000,000 |  | $ 187,000,000
ICBC |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Margin deposits contributed to brokers |  |  |  |  |  | 15,000,000 |  |
Contribution of Equity Capital | OCC |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Commitment contributions |  |  |  |  |  | $ 200,000,000 |  |
OCC |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 40.00% |  |
OCC | Contribution of Equity Capital |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Commitment contributions |  |  |  |  |  | $ 80,000,000 |  |
Cinnober |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
SEK per share offering (in SEK per share) | kr / shares |  | kr 75 |  |  |  |  |  |
SEK per warrant offering (in SEK per warrant) | kr / shares |  | kr 85 |  |  |  |  |  |
Payments to acquire businesses |  |  | $ 190,000,000 |  |  |  |  |
Scenario, Forecast | Cinnober |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |
Payments to acquire businesses |  |  |  | $ 190,000,000 |  |  |  |

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