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Properties, Plants and Equipment (Tables)
 6 Months Ended
Jun. 30, 2020
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
Our investment in properties, plants and equipment (PP&E), with the associated accumulated depreciation, was:

Millions of Dollars
June 30
2020		December 31
2019
Land
$19  19  
Buildings and improvements
94  94  
Pipelines and related assets*
1,452  1,424  
Terminals and related assets*
779  741  
Rail racks and related assets*
137  137  
Processing and related assets*
1,059  1,041  
Caverns and related assets*
636  585  
Construction-in-progress
444  367  
Gross PP&E
4,620  4,408  
Accumulated depreciation
(1,120) (1,059) 
Net PP&E
$3,500  3,349  
*Assets for which we are the lessor.