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Inventories (Tables)
 6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Summary Of Inventories
(In millions)
June 30,
2020
 
December 31,
2019
Crude oil
$
3,163

 
$
3,472

Refined products
5,397

 
5,548

Materials and supplies
1,028

 
996

Merchandise
238

 
227

Inventories before LCM inventory valuation reserve
9,826

 
10,243

LCM inventory valuation reserve
(1,740
)
 
—

Total
$
8,086

 
$
10,243