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Properties, Plants and Equipment (Tables)
6 Months Ended
Jun. 30, 2016
Property, Plant and Equipment [Abstract]  
Properties, Plants and Equipment with Associated Accumulated Depreciation and Amortization
Our investment in properties, plants and equipment (PP&E), with the associated accumulated depreciation and amortization (Accum. D&A), was:

 
Millions of Dollars
 
June 30, 2016
 
December 31, 2015
 
Gross
PP&E

 
Accum.
D&A

 
Net
PP&E

 
Gross
PP&E

 
Accum.
D&A

 
Net
PP&E

 
 
 
 
 
 
 
 
 
 
 
 
Midstream
$
7,651

 
1,477

 
6,174

 
6,978

 
1,293

 
5,685

Chemicals

 

 

 

 

 

Refining
21,075

 
8,256

 
12,819

 
20,850

 
8,046

 
12,804

Marketing and Specialties
1,455

 
788

 
667

 
1,422

 
746

 
676

Corporate and Other
1,129

 
542

 
587

 
1,060

 
504

 
556

 
$
31,310

 
11,063

 
20,247

 
30,310

 
10,589

 
19,721