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Property, Plant and Equipment (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Property, Plant and Equipment [Abstract]      
Original cost $ 114,504   $ 115,006
Less accumulated depreciation and amortization (46,093)   (45,962)
Property, plant and equipment - net 68,411   69,044
Depreciation and amortization $ 2,310 $ 2,220