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Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of inventories Inventories consisted of the following (in millions):
 
March 31,
2019

December 31,
2018
Refinery feedstocks
$
2,338

 
$
2,265

Refined petroleum products and blendstocks
3,572

 
3,653

Ethanol feedstocks and products
328

 
298

Renewable diesel feedstocks and products
50

 
52

Materials and supplies
266

 
264

Inventories
$
6,554

 
$
6,532