Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016 and 2015.

	December 31, 2016			December 31, 2015
	(In millions)
LIFO inventories
FIFO value	$	1,390		$	1,077
LIFO valuation reserve	(75		)	(56		)
LIFO inventories carrying value	1,315			1,021
FIFO inventories	2,705			2,756
Market inventories	4,424			4,066
Supplies and other inventories	387			400
Total inventories	$	8,831		$	8,243