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Supplemental Balance Sheet Information (Details 1) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Property Plant And Equipment [Line Items]    
Gross property, plant and equipment $ 23,241 $ 23,068
Less: Accumulated depreciation (14,611) (14,416)
Property, Plant and Equipment - net $ 8,630 $ 8,652