Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2012

Supplemental Cash Flow Elements [Abstract]

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

	Three Months Ended
	March 31
	2012			2011
	(In millions)
Changes in Assets and Liabilities, Exclusive of Changes Shown Separately
Accounts receivable, net	$	81		$	(10	)
Inventories	125			125
Accrued pensions	1			(194		)
Accounts payable	(53		)	(61		)
Income taxes payable/receivable	(23		)	245
Derivative assets and liabilities	30			(9		)
Gas inventory equalization	114			204
Postretirement obligation	(142		)	(52		)
Other assets	159			93
Other liabilities	(101		)	(101		)
	$	191		$	240

Schedule of Other Significant Noncash Transactions [Table Text Block]

Noncash financing activities:
Common stock issued for employee benefit plans	$	7	$	1