Investment in Unconsolidated Affiliates Summarized Income Statement of Equity Method Investment (Tables)

6 Months Ended

Jun. 30, 2015

Summarized Financial Information of Equity Method Investment [Line Items]

Summarized Income Statement Financial Information, Equity Method Investment [Table Text Block]

	Three Months Ended				Six Months Ended
	June 30,				June 30,
Income Statement	2015		2014		2015		2014
	(In millions)
Operating revenues	$	590	$	827	$	1,206	$	1,828
Cost of sales	277		478		569		1,111
Operating income	93		139		197		301
Net income	77		120		168		269