Acquisitions (Tables)

12 Months Ended

Dec. 31, 2014

Business Combinations [Abstract]

Schedule of Business Acquisitions, by Acquisition [Table Text Block]

The following table summarizes the amounts allocated to the assets acquired and liabilities assumed based upon their fair values at the acquisition dates:

	Closed in Quarter Ended
	June 30,		September 30,
(In millions)	2012		2012
Current assets:
Cash	$	8	$	—
Receivables	22		8
Inventories	1		—
Total current assets acquired	31		8
Property, plant and equipment	822		248
Total assets acquired	853		256
Current liabilities:
Accounts payable	78		23
Total current liabilities assumed	78		23
Asset retirement obligations	7		1
Total liabilities assumed	85		24
Net assets acquired	$	768	$	232