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Restructuring of Operations - Additional Information (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended
	Mar. 31, 2015 employee	Mar. 31, 2015	Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring expense		$ 1us-gaap_RestructuringCharges	$ 9us-gaap_RestructuringCharges
Estimated reduction of employees	100
Restructuring and related activities, completion date period	2 years
Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		1	2
Employee Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense			$ 7

- 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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