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Inventories (Tables)
3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Summary Of Inventories
(In millions)
March 31,
2017
 
December 31,
2016
Crude oil and refinery feedstocks
$
2,148

 
$
2,208

Refined products
2,674

 
2,810

Materials and supplies
414

 
485

Merchandise
156

 
153

Total
$
5,392

 
$
5,656