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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Commitments and Contingencies (Textual) [Abstract]    
Deferred gain $ 129 $ 129
Amortized Deferred Gain 3 7
Interest expense 2 3
S&P/DJ Indices [Member] | CME Group [Member]
   
Related Party Transaction [Line Items]    
Revenues earned under License Agreement with CME Group $ 3