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: |