Goodwill (Tables)

12 Months Ended

Dec. 31, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

	2012			2011
	(In millions)
Balance as of January 1	$	2,020		$	2,020
Goodwill attributable to sale of Unconventional Gas Production business	(2		)	—
Balance at December 31	$	2,018		$	2,020