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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 S&P/DJ Indices [Member] CME Group [Member]	Apr. 30, 2013 Subsequent Event [Member]
Commitments and Contingencies (Textual) [Abstract]
Deferred gain	$ 119
Amortized Deferred Gain	4
Interest expense	1
Related Party Transaction [Line Items]
Revenues earned under License Agreement with CME Group		11
Noncontrolling interest ownership by noncontrolling owners	27.00%
Litigation settlement amount			$ 77

Amount of revenue, fees and commissions earned 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, for example, but not limited to, 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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