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Risks and Uncertainties (Details) (Employee Severance [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Employee Severance [Member]
Restructuring Cost and Reserve
Workforce reduction, office closure and severance expense	$ 10

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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