Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2012

Pension Plans [Member]

Defined Benefit Plan Disclosure [Line Items]

Components of pension expense

	Three Months Ended June  30,						Six Months Ended June  30,
	2012			2011			2012			2011
	(in millions)
Service cost – benefits earned during the period	$	4		$	4		$	7		$	8
Interest cost on projected benefit obligation		18			19			35			37
Expected return on assets		(23	)		(21	)		(44	)		(41	)
Recognized losses		8			8			19			18
Amortization of prior service cost		(2	)		(1	)		(3	)		(2	)
Net periodic pension cost	$	5		$	9		$	14		$	20

Postretirement benefits [Member]

Defined Benefit Plan Disclosure [Line Items]

Components of pension expense

	Three Months Ended June  30,				Six Months Ended June  30,
	2012		2011		2012		2011
	(in millions)
Interest cost	$	1	$	1	$	2	$	2
Amortization of transition obligation		-		-		1		1
Net periodic postretirement benefit cost	$	1	$	1	$	3	$	3