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Investments and Related Matters Investment Segment (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Investment Segment [Member]
Mar. 31, 2011
Icahn Fund Ltd. [Member]
Dec. 31, 2012
Hain [Member]
Investment Segment [Member]
Dec. 31, 2012
Equity Method Investments [Member]
Investment Segment [Member]
Dec. 31, 2011
Equity Method Investments [Member]
Investment Segment [Member]
Dec. 31, 2010
Equity Method Investments [Member]
Investment Segment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value of equity method investment under fair value option $ 314          
Fair value option, recorded gains (losses)       310 49 (23)
Fair value option investment ownership percentage     16.00%      
Liabilities, decrease from deconsolidation   146        
Increased equity attributable to non-controlling interests   $ 146