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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
 
December 31,
(In millions)
2016
 
2015
North America E&P
$
14,158

 
$
15,226

International E&P
2,470

 
2,533

Oil Sands Mining
8,991

 
9,197

Corporate
99

 
105

Net property, plant and equipment
$
25,718

 
$
27,061



Our Libya operations have been interrupted in recent years due to civil unrest.  On September 14, 2016, Force Majeure was lifted and production resumed in October 2016 at our Waha concession.  During December 2016, liftings resumed from the Es-Sider crude oil terminal.
As of December 31, 2016, our net property, plant and equipment investment in Libya is approximately $768 million, and total proved reserves (unaudited) in Libya are 206 mmboe. We and our partners in the Waha concessions continue to assess the situation and the condition of our assets in Libya. Our periodic assessment of the carrying value of our net property, plant and equipment in Libya specifically considers the net investment in the assets, the duration of our concessions and the reserves anticipated to be recoverable in future periods.  The undiscounted cash flows related to our Libya assets continue to exceed the carrying value of $768 million by a significant amount.
Deferred exploratory well costs were as follows:
 
December 31,
(In millions)
2016
 
2015
 
2014
Amounts capitalized less than one year after completion of drilling
$
131

 
$
352

 
$
484

Amounts capitalized greater than one year after completion of drilling
118

 
85

 
126

Total deferred exploratory well costs
$
249

 
$
437

 
$
610

Number of projects with costs capitalized greater than one year after
 
 
 
 
 
completion of drilling
3

 
2

 
3

 
 
 
 
 
 
 
 
(In millions)
2016
 
2015
 
2014
Beginning balance
$
437

 
$
610

 
$
793

Additions
299

 
610

 
647

Charges to expense
(23
)
 
(148
)
 
(45
)
Transfers to development
(388
)
 
(635
)
 
(579
)
Dispositions(a)
(76
)
 
—

 
(206
)
Ending balance
$
249

 
$
437

 
$
610


(a) 
Includes sale of GOM assets in 2016, and the sale of Angola assets and Norway business in 2014.
Exploratory well costs capitalized greater than one year after completion of drilling as of December 31, 2016 are summarized by geographical area below:
(In millions)
  
Gabon
$
64

E.G.
54

Total
$
118


Well costs that have been suspended for longer than one year are associated with three projects. Management believes these projects with suspended exploratory drilling costs exhibit sufficient quantities of hydrocarbons to justify potential development based on current plans.
Gabon - The Diaba-1B well reached total depth in the third quarter of 2013. Additional 3D seismic data was acquired in late 2014 in the western part of the block, and depth processing continued through the third quarter of 2016.  We continue to utilize this data to facilitate evaluation of additional resource potential on the offshore Diaba License to support decisions regarding the exploration program.
E.G. – The Corona well on Block D offshore E.G. was drilled in 2004, and we acquired an additional interest in the well in 2012. We plan to develop Block D through a unitization with the Alba field. Negotiations have been substantially completed and we are awaiting approval from the host government.
Drilling was completed on the Rodo well in Alba Block Sub Area B, offshore E. G. in the first quarter of 2015, and we have since completed a seismic feasibility study. In early 2017, we received approval to perform a seismic reprocessing program and after completion, will evaluate drilling opportunities within Sub Area B.