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Investments In Unconsolidated Affiliates And Related Party Transactions (Summarized Combined Financial Information Of Equity Method Unconsolidated Affiliates - Balance Sheet) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Current assets $ 6,880 $ 6,223
Current liabilities (5,528) (3,897)
Equity Method Investments [Member]
   
Current assets 492 413
Non-current assets 1,599 1,599
Current liabilities (267) (242)
Non-current liabilities (225) (145)
Net assets $ 1,599 $ 1,625