Summary Of Significant Accounting Policies Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Inventories [Abstract]

Schedule of inventory by costing method

	December 31, 2013			December 31, 2012
	(In millions)
LIFO inventories
FIFO value	$	1,408		$	1,356
LIFO valuation reserve	(297		)	(522		)
LIFO inventories carrying value	1,111			834
FIFO inventories	3,741			5,232
Market inventories	6,059			7,036
Supplies and other inventories	530			734
Total inventories	$	11,441		$	13,836