Restructuring Charges (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring and Related Activities [Abstract]
Severance	$ 0us-gaap_SeveranceCosts1	$ 2us-gaap_SeveranceCosts1	$ 6us-gaap_SeveranceCosts1
Lease obligations	0us-gaap_BusinessExitCosts1	(1)us-gaap_BusinessExitCosts1	0us-gaap_BusinessExitCosts1
Other exit costs	0us-gaap_OtherRestructuringCosts	2us-gaap_OtherRestructuringCosts	4us-gaap_OtherRestructuringCosts
Total	$ 0	$ 3	$ 10

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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

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- Definition

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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