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Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Summary of Inventories

Inventories consisted of the following:

 
Millions of Dollars
 
March 31
2020

 
December 31
2019

 
 
 
 
Crude oil and petroleum products
$
5,008

 
3,452

Materials and supplies
323

 
324

 
$
5,331

 
3,776