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Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Summary Of Inventories
(In millions)
September 30,
2019
 
December 31,
2018
Crude oil and refinery feedstocks
$
3,415

 
$
3,655

Refined products
5,152

 
5,234

Materials and supplies
907

 
720

Merchandise
222

 
228

Total
$
9,696

 
$
9,837