XML 107 R92.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Payments for tax settlements |  |  | $ 40 |  |
Adjustment to tax expense | $ (4) | $ 5 |  | $ (89) |
Sweden | Foreign Tax Authority |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Tax expense (benefits) associated with foreign tax agency |  | 57 |  |  | $ 41
Tax expense (benefits), per diluted share (in dollars per share) |  |  |  |  | $ 0.24
Quarterly recurring tax benefits |  |  | $ 1 |  |
Retained Earnings | Accounting Standards Update 2018-02 |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Reclassification from AOCI, tax amount |  | 142 |  |  |
Accumulated Other Comprehensive Loss | Accounting Standards Update 2018-02 |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Reclassification from AOCI, tax amount |  | (142) |  |  |
Employee Benefit Plan Adjustment Gains And Losses | Accounting Standards Update 2018-02 |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Reclassification from AOCI, tax amount |  | (135) |  |  |
Net Foreign Currency Transaction Gains And Losses | Accounting Standards Update 2018-02 |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Reclassification from AOCI, tax amount |  | $ (7) |  |  |

X
- Definition Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority Per Diluted Share + References No definition available. + Details
Name: | ndaq_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthorityPerDilutedShare
Namespace Prefix: | ndaq_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Payments For Tax Settlements + References No definition available. + Details
Name: | ndaq_PaymentsForTaxSettlements
Namespace Prefix: | ndaq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Recurring Tax Benefits + References No definition available. + Details
Name: | ndaq_RecurringTaxBenefits
Namespace Prefix: | ndaq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit) + References No definition available. + Details
Name: | ndaq_TaxCutsandJobsActof2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit
Namespace Prefix: | ndaq_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect + References No definition available. + Details
Name: | ndaq_TaxCutsandJobsActof2017ReclassificationfromAOCItoRetainedEarningsTaxEffect
Namespace Prefix: | ndaq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
Name: | us-gaap_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OperatingLossCarryforwardsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=country_SE
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_ForeignCountryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_RetainedEarningsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=ndaq_AccountingStandardsUpdate201802Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedOtherComprehensiveIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedTranslationAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |