Clearing Operations (Schedule of Clearing Member Default Fund Contributions And Margin Deposits) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014
Clearing Operations [Line Items]
Default fund contributions	$ 392
Margin deposits	9,484
Default fund contributions and margin deposits	9,876
Cash Contributions [Member]
Clearing Operations [Line Items]
Default fund contributions	264	[1],[2]
Margin deposits	1,989	[1],[2]
Default fund contributions and margin deposits	2,253	[1],[2]
Non-Cash Contributions [Member]
Clearing Operations [Line Items]
Default fund contributions	128
Margin deposits	7,495
Default fund contributions and margin deposits	$ 7,623

[1] As of March 31, 2014, in accordance with its investment policy, NASDAQ OMX Nordic Clearing has invested cash contributions of $1,501 million in reverse repurchase agreements and $710 million in highly rated government debt securities

[2] Pursuant to clearing member agreements, we pay interest on cash contributions to clearing members.