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Clearing Operations (Schedule of Clearing Member Default Fund Contributions And Margin Deposits Additional Information) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Clearing Operations [Line Items] |  |  |  |
Investment of cash contributions in highly rated debt securities | $ 1,910 | [1] | $ 175 | [1]
NASDAQ OMX Nordic [Member] |  |  |  |
Clearing Operations [Line Items] |  |  |  |
Default fund cash contributions invested in repurchase agreements | 1,229 |  |  |
Default fund cash contributions invested in highly rated governmant debt securities | $ 663 |  |  |
[1] | Default fund and margin deposit investments include cash contributions invested by NASDAQ OMX Nordic Clearing, in accordance with its investment policy, either in highly rated government debt securities or reverse repurchase agreements with highly rated government debt securities as collateral. Of the total balance of $1,934 million recorded in the Condensed Consolidated Balance Sheets as of September 30, 2013, $1,229 million of cash contributions have been invested in reverse repurchase agreements and $681 million of cash contributions have been invested in highly rated government debt securities and term deposits. The remainder of this balance is held in cash. As of December 31, 2012, $175 million of cash contributions were invested in highly rated government debt securities. See Note 14, “Clearing Operations,” for further discussion of default fund contributions and margin deposits.

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- Definition Default fund cash contributions invested in highly rated governmant debt securities + References No definition available. + Details
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- Definition Default fund cash contributions invested in repurchase agreements. + References No definition available. + Details
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