Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

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, 2019 and 2018.

	December 31, 2019			December 31, 2018
	(In millions)
LIFO inventories
FIFO value	$	1,022		$	1,010
LIFO valuation reserve	(91		)	(54		)
LIFO inventories carrying value	931			956
FIFO inventories	3,106			2,908
Market inventories	4,704			4,547
Supplies and other inventories	429			402
Total inventories	$	9,170		$	8,813