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Equity Method Investments And Variable Interest Entities (Consolidated Summarized Financial Information) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]    
Current assets $ 2,331 $ 3,098
Noncurrent assets 3,435 4,069
Total assets 5,766 7,167
Current liabilities 1,501 2,969
Noncurrent liabilities 3,742 4,090
Total liabilities $ 5,243 $ 7,059