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Commitments, Contingencies and Guarantees (Details)		12 Months Ended
	Sep. 02, 2014 exchange	Dec. 31, 2018 USD ($) shares	Oct. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Financial guarantees obtained		$ 12,000,000		$ 14,000,000
National exchanges named as defendants | exchange	7
Estimate of possible legal fees			$ 1,000,000
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
Escrow Agreement
Commitments and Contingencies Disclosure [Line Items]
Contingency, accrual		12,000,000
Clearinghouse Credit Facilities
Commitments and Contingencies Disclosure [Line Items]
Credit facility, available liquidity		220,000,000		$ 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

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Minimum amount of revenue required to trigger annual issuance of stock

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Financial guarantees obtained to provide further liquidity and default protection related to clearing businesses

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Number Of National Exchanges Named As Defendants

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

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Amount receivable from broker-dealers and clearing organizations, including, but not limited to, securities failed-to-deliver, certain deposits for securities borrowed, open transactions, good faith and margin deposits, commissions and floor brokerage receivables.

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Number of shares of stock issued during the period pursuant to acquisitions.

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