v2.4.0.8

Clearing Operations (Schedule of Clearing Member Default Fund Contributions And Margin Deposits) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013
--- | ---
Clearing Operations [Line Items] |  |
Default fund contributions | $ 314 |
Margin deposits | 11,174 |
Default fund contributions and margin deposits | 11,488 |
Cash Contributions [Member] |  |
Clearing Operations [Line Items] |  |
Default fund contributions | 239 | [1],[2]
Margin deposits | 1,695 | [1],[2]
Default fund contributions and margin deposits | 1,934 | [1],[2]
Non-Cash Contributions [Member] |  |
Clearing Operations [Line Items] |  |
Default fund contributions | 75 |
Margin deposits | 9,479 |
Default fund contributions and margin deposits | $ 9,554 |
[1] | As of September 30, 2013, in accordance with its investment policy, NASDAQ OMX Nordic Clearing has invested cash contributions of $1,229 million in reverse repurchase agreements and $663 million in highly rated government debt securities
[2] | Pursuant to clearing member agreements, we pay interest on cash contributions to clearing members.

X
- 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