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Clearing Operations (Schedule of Clearing Member Default Fund Contributions Additional Information) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Clearing Operations [Line Items]
Investment of cash contributions in highly rated debt securities	$ 191	[1]	$ 175	[1]
NASDAQ OMX Nordic [Member]
Clearing Operations [Line Items]
Investment of cash contributions in highly rated debt securities	$ 73
[1] Default fund 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. As of March 31, 2013, $118 million of cash contributions have been invested in reverse repurchase agreements and $73 million of cash contributions have been invested in highly rated government debt securities. 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.

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Clearing member cash contribution invested in highly rated government debt securities.

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