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Acquisitions and Dispositions (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dispositions      
Proceeds from sale of various property and equipment $ 200 $ 22 $ 12
Gain (loss) on sale of various property and equipment   6 (6)
Maximum
     
Dispositions      
Gain (loss) on sale of various property and equipment $ 1