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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Schedule of inventory by costing method [Table Text Block]
The following table sets forth the Company’s inventories as of December 31, 2017 and 2016.

 
December 31, 2017
 
December 31, 2016
 
(In millions)
LIFO inventories
 
 
 
FIFO value
$
1,056

 
$
1,390

LIFO valuation reserve
(73
)
 
(75
)
LIFO inventories carrying value
983

 
1,315

FIFO inventories
2,906

 
2,705

Market inventories
4,886

 
4,424

Supplies and other inventories
398

 
387

Total inventories
$
9,173

 
$
8,831