Inventories	6 Months Ended
Jun. 30, 2021
Inventories [Abstract]
Inventories	Note 2—Inventories Inventories consisted of the following: Millions of Dollars June 30 December 31 2021 2020 Crude oil and natural gas $ 572 461 Materials and supplies 566 541 $ 1,138 1,002 Inventories valued on the LIFO basis totaled $ 348 million and $ 282 million at June 30, 2021 and December 31, 2020, respectively.

The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-URI http://asc.fasb.org/topic&trid=2126998

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