Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 413us-gaap_ProfitLoss	$ 384us-gaap_ProfitLoss	$ 349us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	137us-gaap_DepreciationAndAmortization	122us-gaap_DepreciationAndAmortization	104us-gaap_DepreciationAndAmortization
Share-based compensation	62us-gaap_ShareBasedCompensation	47us-gaap_ShareBasedCompensation	46us-gaap_ShareBasedCompensation
Excess tax benefits related to share-based payments	(15)	(16)	(7)
Gain on sale of investment security		(30)
Deferred income taxes	(6)us-gaap_DeferredIncomeTaxExpenseBenefit	28us-gaap_DeferredIncomeTaxExpenseBenefit	16us-gaap_DeferredIncomeTaxExpenseBenefit
Non-cash restructuring charges		1	16
Non-cash merger and strategic initiatives	20us-gaap_NoncashMergerRelatedCosts
Loss on divestiture of business			14
Asset impairment charges	49	14	40
Other reconciling items included in net income	28us-gaap_OtherNoncashIncomeExpense	11us-gaap_OtherNoncashIncomeExpense	16us-gaap_OtherNoncashIncomeExpense
Net change in operating assets and liabilities, net of effects of acquisitions:
Receivables, net	(16)us-gaap_IncreaseDecreaseInReceivables	(55)us-gaap_IncreaseDecreaseInReceivables	(30)us-gaap_IncreaseDecreaseInReceivables
Other assets	(55)	8	71
Accounts payable and accrued expenses	(40)	51	1
Section 31 fees payable to SEC	42	(15)	(9)
Accrued personnel costs	(4)	39	(27)
Deferred revenue	64	(33)	5
Other liabilities	8	18	(17)
Net cash provided by operating activities	687	574	588
Cash flows from investing activities:
Purchases of trading securities	(283)	(437)	(301)
Proceeds from sales and redemptions of trading securities	281	452	372
Purchases of available-for-sale investment securities	(20)
Proceeds from sale of available-for-sale investment securities	17	48
Purchase of equity and cost method investments		(43)
Acquisitions of businesses, net of cash and cash equivalents acquired		(1,121)	(112)
Purchases of property and equipment	(140)	(115)	(87)
Other investment activities	(10)
Net cash used in investing activities	(155)	(1,216)	(128)
Cash flows from financing activities:
Payments of debt obligations	(970)us-gaap_RepaymentsOfLongTermDebt	(289)us-gaap_RepaymentsOfLongTermDebt	(145)us-gaap_RepaymentsOfLongTermDebt
Proceeds from debt obligations, net of debt issuance costs	735	895
Cash paid for repurchase of common stock	(178)	(10)	(275)
Cash dividends	(98)us-gaap_PaymentsOfDividends	(87)us-gaap_PaymentsOfDividends	(65)us-gaap_PaymentsOfDividends
Proceeds received from employee stock activity	40	35	6
Payments related to employee shares withheld for taxes	(31)	(12)	(3)
Excess tax benefits related to share-based payments	15	16	7
Other financing activities	2	(1)	(4)
Net cash provided by (used in) financing activities	(485)	547	(479)
Effect of exchange rate changes on cash and cash equivalents	(18)	(4)	10
Net increase (decrease) in cash and cash equivalents	29	(99)	(9)
Cash and cash equivalents at beginning of period	398	497	506
Cash and cash equivalents at end of period	427	398	497
Cash paid for:
Interest	114us-gaap_InterestPaid	79us-gaap_InterestPaid	80us-gaap_InterestPaid
Income taxes, net of refund	190us-gaap_IncomeTaxesPaidNet	157us-gaap_IncomeTaxesPaidNet	177us-gaap_IncomeTaxesPaidNet
Non-cash investing activities:
Cost method investment	75ndaq_CostMethodInvestment
Acquisition of eSpeed contingent future issuance of Nasdaq common stock		484
Investment in LCH Clearnet Group Limited			$ 37us-gaap_TransferToInvestments

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow associated with other investments held by the entity for investment purposes not otherwise defined in the taxonomy.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Value of investments transferred to the entity's investments in noncash transactions.

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