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Equity Method Investments And Variable Interest Entities (Consolidated Summarized Financial Information Statements Of Operations) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Equity Method Investments and Joint Ventures [Abstract]      
Revenue $ 3,717 $ 6,439 $ 4,800
Operating income 635 659 660
Net income $ 476 $ 419 $ 355