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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018 and 2017.

 
December 31, 2018
 
December 31, 2017
 
(In millions)
LIFO inventories
 
 
 
FIFO value
$
1,011

 
$
1,056

LIFO valuation reserve
(55
)
 
(73
)
LIFO inventories carrying value
956

 
983

FIFO inventories
2,908

 
2,906

Market inventories
4,547

 
4,886

Supplies and other inventories
402

 
398

Total inventories
$
8,813

 
$
9,173