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Variable Interest Entities and Unconsolidated Investments (Equity Method Investment Summarized Financial Information) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Equity Method Investment, Summarized Financial Information, Assets [Abstract]      
Equity Method Investment Summarized Financial Information Cash and Cash Equivalents $ 64 $ 76  
Equity Method Investment, Summarized Financial Information, Current Assets 30 37  
Equity Method Investment, Summarized Financial Information, Property, Plant and Equipment, net 648 656  
Equity Method Investment, Summarized Financial Information, Noncurrent Assets 4 3  
Equity Method Investment, Summarized Financial Information, Assets 746 772  
Equity Method Investment, Summarized Financial Information, Liabilities [Abstract]      
Equity Method Investment, Summarized Financial Information, Current Maturities of Long-term Debt 25 24  
Equity Method Investment, Summarized Financial Information, Current Liabilities 36 47  
Equity Method Investment, Summarized Financial Information, Long-Term Debt 423 438  
Equity Method Investment, Summarized Financial Information, Long-term Derivative Liabilities 84 85  
Equity Method Investment, Summarized Financial Information, Liabilities 568 594  
Equity Method Investment Summarized Financial Information, Equity [Abstract]      
Equity Method Investment Summarized Financial Information, Equity 178 178  
Equity Method Investment, Summarized Financial Information, Liabilities and Equity 746 772  
Equity Method Investment, Summarized Financial Information, Gross Profit (Loss) [Abstract]      
Equity Method Investment, Summarized Financial Information, Revenue 247 277 228
Equity Method Investment, Summarized Financial Information, Cost of Sales 171 208 183
Equity Method Investment, Summarized Financial Information, Gross Profit (Loss) 76 69 45
Equity Method Investment Summarized Financial Information Interest (Income) Expense 27 30 27
Equity Method Investment Summarized Financial Information Other (Income) Expense Net (2) 2 0
Equity Method Investment, Summarized Financial Information, Net Income (Loss) $ 51 $ 37 $ 18