v2.4.0.8
Clearing Operations (Narrative) (Details) (USD $)
 9 Months Ended
Sep. 30, 2013
contract
Dec. 31, 2012
Sep. 30, 2012
contract
Sep. 30, 2013
NASDAQ OMX Nordic [Member]
Sep. 30, 2012
NASDAQ OMX Nordic [Member]
Sep. 30, 2013
Liability Waterfall [Member]
Sep. 30, 2013
NOS Clearing [Member]
Dec. 31, 2012
NOCC [Member]
Sep. 30, 2013
NOCC guarantee fund [Member]
Dec. 31, 2012
NOCC guarantee fund [Member]
Clearing Operations [Line Items]                    
Financial investments, at fair value $ 190,000,000 [1] $ 223,000,000 [1]   $ 57,000,000            
Credit facility, borrowing capacity       93,000,000            
Contract value of resale and repurchase agreements       5,600,000,000 4,700,000,000          
Power of assessment of the clearing member's contribution to the financial markets and commodities markets default funds       100.00%            
Junior capital, cash deposits and pledged assets           22,000,000        
Senior capital, cash deposits and pledged assets           28,000,000        
Market value of derivative contracts outstanding, prior to netting 1,359,000,000           75,000,000      
Total number of derivative contracts cleared through NOS Clearing 74,849,697   81,799,340              
Restricted cash 81,000,000 85,000,000                
Default Fund Contributions 314,000,000           42,000,000      
Pledged default fund contributions and margin collateral             569,000,000      
Cash collateral for borrowed securities               33,000,000    
Aggregate amount of letters of credit               101,000,000    
Contribution to guarantee fund                 $ 25,000,000 $ 25,000,000
[1] Primarily comprised of trading securities, mainly Swedish government debt securities, of $145 million as of September 30, 2013 and $201 million as of December 31, 2012. Of these securities, $102 million as of September 30, 2013 and $134 million as of December 31, 2012 are assets utilized to meet regulatory capital requirements primarily for clearing operations at NASDAQ OMX Nordic Clearing. This balance also includes our available-for-sale investment security in DFM valued at $45 million as of September 30, 2013 and $22 million as of December 31, 2012. See Note 6, “Investments,” for further discussion of our trading investment securities and available-for-sale investment security.