Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2012

Supplemental Cash Flow Elements [Abstract]

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

	2012			2011			2010
Changes in Assets and Liabilities, Exclusive of Changes Shown Separately	(In millions)
Accounts receivable, net	$	24		$	(62	)	$	—
Inventories	7			(53		)	(71		)
Recoverable pension and postretirement costs	106			(436		)	(26		)
Accrued pension liability — affiliates	137			271			(27		)
Accounts payable	(64		)	41			47
Income taxes payable/receivable	114			54			(77		)
Accrued postretirement liability — affiliates	(221		)	157			3
Regulatory assets	125			(18		)	(77		)
Other assets	108			(80		)	(54		)
Other liabilities	(78		)	(15		)	29
	$	258		$	(141	)	$	(253	)

Additional Supplementary Cash Flow Information [Table] [Table Text Block]

	2012		2011			2010
Cash paid (received) for:	(In millions)
Interest (excluding interest capitalized)	$	280	$	294		$	315
Income taxes	223		(18		)	28

Schedule of Other Significant Noncash Transactions [Table Text Block]

Supplementary non-cash information for the years ended December 31 were as follows:

	2012			2011		2010
	(In millions)
Change in capital expenditures not paid	$	(22	)	$	47	$	27