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Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories consisted of the following:

 Millions of Dollars
 June 30
2020
December 31
2019
Crude oil and petroleum products$4,806  3,452  
Materials and supplies330  324  
$5,136  3,776