XML 120 R102.htm IDEA: XBRL DOCUMENT v3.10.0.1

Clearing Operations (Schedule of Clearing Member Default Fund Contributions And Margin Deposits) (Details) $ in Millions	Dec. 31, 2018 USD ($)
Clearing Operations [Line Items]
Default fund contributions	$ 499
Margin deposits	7,445
Total	7,944
Cash Contributions
Clearing Operations [Line Items]
Default fund contributions	370
Margin deposits	4,372
Total	4,742
Non-Cash Contributions
Clearing Operations [Line Items]
Default fund contributions	129
Margin deposits	3,073
Total	$ 3,202

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

Default fund Contributions.

+ References

No definition available.

+ Details

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

X

- Definition

Default fund contributions and margin deposits

+ References

No definition available.

+ Details

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

X

- Definition

Margin deposits

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=ndaq_NordicClearingMembersCashContributionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=ndaq_NordicClearingMembersNonCashContributionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: