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Discontinued Operations (Summarized Results of Discontinued Operations) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Summarized results of discontinued operations:      
Operating revenue $ 0 $ 1,626 $ 2,180
Loss before income taxes $ 0 $ (2,235) $ (1,931)