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Inventories (Tables)
 12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Summary Of Inventories
 
December 31,    
(In millions)
2016
 
2015
Crude oil and refinery feedstocks
$
2,208

 
$
2,180

Refined products
2,810

 
2,804

Materials and supplies
485

 
438

Merchandise
153

 
173

Lower of cost or market reserve
—

 
(370
)
Total
$
5,656

 
$
5,225