XML 104 R89.htm IDEA: XBRL DOCUMENT v3.10.0.1

Clearing Operations (Schedule of Derivative Contracts) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($) TWh shares	Sep. 30, 2017 TWh shares
Clearing Operations [Line Items]
Market value of derivative contracts | $	$ 1,904
Total number of cleared contracts | shares	71,644,112	69,647,824
Total volume in cleared power, in Terawatt hours (TWh) | TWh	853	911
Commodity and seafood options, futures and forwards
Clearing Operations [Line Items]
Market value of derivative contracts | $	$ 1,106
Total number of cleared contracts | shares	1,506,560	2,040,033
Fixed-income options and futures
Clearing Operations [Line Items]
Market value of derivative contracts | $	$ 520
Total number of cleared contracts | shares	16,833,278	14,788,850
Stock options and futures
Clearing Operations [Line Items]
Market value of derivative contracts | $	$ 187
Total number of cleared contracts | shares	17,735,228	20,070,584
Index options and futures
Clearing Operations [Line Items]
Market value of derivative contracts | $	$ 91
Total number of cleared contracts | shares	35,569,046	32,748,357

X

- Definition

Clearing Operations [Line Items]

+ References

No definition available.

+ Details

Name:	ndaq_ClearingOperationsLineItems
Namespace Prefix:	ndaq_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Derivative contracts market value

+ References

No definition available.

+ Details

Name:	ndaq_DerivativeContractsMarketValue
Namespace Prefix:	ndaq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Total volume in cleared power.

+ References

No definition available.

+ Details

Name:	ndaq_TotalVolumeInClearedPower
Namespace Prefix:	ndaq_
Data Type:	num:energyItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

+ Details

Name:	us-gaap_DerivativeNumberOfInstrumentsHeld
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ndaq_CommodityForwardsAndOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ndaq_FixedIncomeOptionsAndFuturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ndaq_StockOptionsAndFuturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ndaq_IndexOptionsAndFuturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: