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Acquisition (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Allocation of the Purchase Price to Assets and Liabilities [Line Items]  
Business Combination, Cash $ 22
Business Combination, Accounts receivables 14
Business Combination, Other Current assets 8
Business Combination, Property, Plant and Equipment 100
Business Combination, Intangible assets 75
Business Combination, Other Noncurrent Assets 9
Business Combination, Current Liabilities (7)
Business Combination, Non-controlling Interest (1)
Business Combination, Purchase Price $ 220