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

Inventories consisted of the following (in millions):
 
March 31,
2020

December 31,
2019
Refinery feedstocks
$
2,016

 
$
2,399

Refined petroleum products and blendstocks
3,616

 
4,034

Renewable diesel feedstocks and products
44

 
46

Ethanol feedstocks and products
270

 
260

Materials and supplies
277

 
274

Inventories before LCM inventory valuation reserve
6,223

 
7,013

LCM inventory valuation reserve
(2,548
)
 
—

Inventories
$
3,675

 
$
7,013