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Restructuring (Details) (Other Current Liabilities [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Other Current Liabilities [Member]
Restructuring Cost and Reserve [Line Items]
Unpaid termination benefits	$ 14	$ 21
Additional costs during the quarter	$ 1

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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