Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2013

Supplemental Cash Flow Elements [Abstract]

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

	Three Months Ended March 31,
	2013			2012
	(In millions)
Changes in Assets and Liabilities, Exclusive of Changes Shown Separately
Accounts receivable, net	$	(78	)	$	81
Inventories	221			125
Accrued/prepaid pensions	(46		)	1
Accounts payable	(126		)	(53		)
Income taxes payable/receivable	14			(23		)
Derivative assets and liabilities	18			30
Postretirement obligation	(154		)	(142		)
Gas inventory equalization	140			114
Other assets	137			159
Other liabilities	(82		)	(101		)
	$	44		$	191

Schedule of Other Significant Noncash Transactions [Table Text Block]

Supplementary non-cash information is as follows:

	Three Months Ended March 31,
	2013			2012
	(In millions)
Common stock issued for employee benefit plans	$	60		$	7
Change in capital expenditures not paid	$	(16	)	$	(43	)