Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2012

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Schedule of Defined Benefit Plans Disclosures

The components of pension benefit expense and other postretirement benefit expense (income) included in the condensed statements of consolidated operations for the three and six months ended June 30, 2012 and 2011, were (in millions):

	Pension Benefits
	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2012			2011			2012			2011
Service cost	$	7		$	7		$	14		$	14
Interest cost	8			8			15			15
Expected return on plan assets	(6		)	(5		)	(12		)	(10		)
Recognized net actuarial loss	5			5			11			10
Recognized curtailment loss	—			1			—			3
Net Periodic Benefit Expense	$	14		$	16		$	28		$	32
	Other Postretirement Benefits
	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2012			2011			2012			2011
Service cost	$	1		$	2		$	2		$	3
Interest cost	1			1			2			2
Amortization of prior service credit	(10		)	(10		)	(19		)	(19		)
Recognized net actuarial loss	3			3			6			6
Net Periodic Benefit Income	$	(5	)	$	(4	)	$	(9	)	$	(8	)