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Property, Plant and Equipment
3 Months Ended
Mar. 31, 2013
Property Plant And Equipment Disclosure [Abstract]  
Property, Plant and Equipment [Text Block]
 Property, Plant and Equipment
 
March 31,
 
December 31,
(In millions)
2013
 
2012
North America E&P
$
24,500

 
$
23,748

International E&P
13,429

 
13,214

Oil Sands Mining
10,171

 
10,127

Corporate
477

 
449

Total property, plant and equipment
48,577

 
47,538

Less accumulated depreciation, depletion and amortization
(20,195
)
 
(19,266
)
Net property, plant and equipment
$
28,382

 
$
28,272


In the first quarter of 2011, production operations in Libya were suspended. In the fourth quarter of 2011, limited production resumed.  Since that time, average sales volumes have increased to near pre-conflict levels.  We and our partners in the Waha concessions continue to assess the condition of our assets in Libya and uncertainty around sustained production and sales levels remains. As of March 31, 2013, our net property, plant and equipment investment in Libya was approximately $748 million.
Exploratory well costs capitalized greater than one year after completion of drilling were $220 million as of March 31, 2013.  The net decrease in such costs from December 31, 2012 primarily related to the conveyance of our interest in the Marcellus natural gas shale play to the operator in February 2013.