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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Commitments and Contingencies (Textual) [Abstract]
Deferred gain	$ 126	$ 126
Amortized Deferred Gain	3	10
Interest expense	1	5
S&P/DJ Indices [Member] \| CME Group [Member]
Related Party Transaction [Line Items]
Revenues earned under License Agreement with CME Group	$ 10

Revenues arising from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's' management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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