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Properties, Plants and Equipment
6 Months Ended
Jun. 30, 2020
Property, Plant and Equipment [Abstract]  
Properties, Plants and Equipment Properties, Plants and Equipment
Our gross investment in PP&E and the associated accumulated depreciation and amortization (Accum. D&A) balances were as follows:

 Millions of Dollars
 June 30, 2020December 31, 2019
 Gross
PP&E
Accum.
D&A
  Net
PP&E
Gross
PP&E
Accum.
D&A
Net
PP&E
Midstream$11,931  2,543  9,388  11,221  2,391  8,830  
Chemicals—  —  —  —  —  —  
Refining24,110  10,730  13,380  23,692  10,336  13,356  
Marketing and Specialties (M&S)1,695  945  750  1,847  959  888  
Corporate and Other1,401  637  764  1,311  599  712  
$39,137  14,855  24,282  38,071  14,285  23,786