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Property and Equipment, Net (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Property and Equipment, Net (Textual) [Abstract]
Depreciation expenses	$ 32	$ 36
Net Capital lease assets	89		94
Property and equipment additions	24	15
Interest on capital projects capitalized	$ 1	$ 1

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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