Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2011

Retirement Plans [Abstract]

Weighted-average assumptions used to determine benefit obligations

	Pension Benefits		Other Postretirement  Benefits
	December 31,		December 31,
	2011	2010	2011	2010
Discount rate	4.7%-4.9%	5.4%-5.8%	4.6%-4.8%	5.3%-5.5%
Rate of compensation increase	4.8%	4.8%

Weighted-average assumptions used to determine net periodic benefit cost

	Pension Benefits			Other Postretirement Benefits
	Year Ended December 31,			Year Ended December 31,
	2011	2010	2009	2011	2010	2009
Discount rate	5.4%-5.8%	6.0%	6.3%	5.3%-5.5%	6.0%	6.3%
Expected long-term return on plan assets	7.5%	7.5%	7.5%
Rate of compensation increase	4.8%	4.8%	5.0%

Assumed health care cost trend rates for other postretirement benefits

	Other Postretirement Benefits
	Year Ended December 31,
	2011			2010
Pre-65 health care cost trend rate assumed for next year		9.0	%		9.5	%
Post-65 health care cost trend rate assumed for next year		8.0	%		8.5	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)		5.0	%		5.0	%
Year that the rate reaches the ultimate trend rate:
Pre-65		2020			2020
Post-65		2018			2018

A one-percentage-point change in assumed health care cost trend rates effects

	One Percentage Point
	Increase		Decrease
	(In millions)
Effect on total of service and interest cost	$	1	$	(1	)
Effect on postretirement benefit obligations		14		(12	)

Net periodic pension and other retirement benefit costs

	Pension Benefits									Other Postretirement Benefits
	Year Ended December 31,									Year Ended December 31,
	2011			2010			2009			2011			2010			2009
	(In millions)
Service cost	$	18		$	17		$	17		$	4		$	4		$	4
Interest cost		56			56			56			10			12			12
Expected return on plan assets		(73	)		(68	)		(61	)		—			—			—
Amortization of unrecognized net loss (gain)		8			7			15			—			(1	)		(1	)
Amortization of unrecognized prior service cost		4			5			5			(1	)		(1	)		(1	)
Net periodic benefit cost	$	13		$	17		$	32		$	13		$	14		$	14

Reconciliation of benefit obligations, plan assets and funded status of the pension and postretirement plans

	Pension Benefits						Other Postretirement Benefits
	December 31,						December 31,
	2011			2010			2011			2010
	(In millions)
Change in benefit obligation:
Benefit obligation at January 1	$	1,023		$	962		$	197		$	206
Service cost		18			17			4			4
Interest cost		56			56			10			12
Plan participants’ contributions		—			—			5			5
Amendments		9			—			—			—
Actuarial (gain) loss		144			48			15			(11	)
Benefits paid		(67	)		(60	)		(21	)		(20	)
Other								2			1
Benefit obligation at December 31		1,183			1,023			212			197
Change in plan assets:
Fair value of plan assets at January 1		989			921			—			—
Actual return on plan assets		48			109			—			—
Employer contributions		28			19			16			15
Plan participants’ contributions		—			—			5			5
Benefits paid from plan assets		(67	)		(60	)		(21	)		(20	)
Fair value of plan assets at December 31		998			989			—			—
Funded status		(185	)		(34	)	$	(212	)	$	(197	)
Amounts recognized in the balance sheets consist of:
Noncurrent assets		—			66		$	—		$	—
Current liabilities		—			—			(14	)		(13	)
Noncurrent liabilities		(185	)		(100	)		(198	)		(184	)
Net amount recognized	$	(185	)	$	(34	)	$	(212	)	$	(197	)
Net actuarial (gain) loss	$	168		$	7		$	15		$	(11	)
Recognized actuarial gain (loss)		(7	)		(7	)		1			1
Prior service cost		10			—			—			—
Recognized prior service (cost)		(4	)		(5	)		—			—
Total recognized in accumulated other comprehensive (income) loss	$	167		$	(5	)		16		$	(10	)
Total recognized net periodic benefit cost and other	$	180		$	12		$	29		$	5

Pension plans with an accumulated benefit obligation in excess of plan assets

	Pension Benefits
	December 31,
	2011		2010
	(In millions)
Projected benefit obligation	$	1,183	$	558
Accumulated benefit obligation		1,111		501
Fair value of plan assets		998		459

Estimated amounts to be recognized from accumulated other comprehensive income into net periodic benefit cost

	Pension Benefits		Other Postretirement Benefits
	(In millions)
Amortization of actuarial (gain) loss	$	22	$	—
Amortization of prior service cost		4		—
Total estimated amounts to be recognized	$	26		—

Expected future minimum benefit payments

Expected future benefit payments	Pension Benefits		Other Postretirement Benefit Plans		Less Medicare Drug Subsidy		Net
	(In millions)
2012	$	68	$	15	$	1	$	14
2013		70		16		1		15
2014		72		16		1		15
2015		73		17		1		16
2016		75		17		1		16
2017 – 2021		399		86		4		82
	$	757	$	167	$	9	$	158

Pension plans asset allocations

	Asset Allocation as  of 12/31/11		Asset Allocation as  of 12/31/10
	(%)		(%)
Asset Class
U.S. Equity		14.0		15.1
Global ex U.S. Equity		10.4		11.6
Emerging Markets Equity		3.6		3.5
Absolute Return Hedge Funds		11.7		11.7
Equity Hedge Funds		10.7		12.9
Private Equity		4.7		4.2
Private Real Assets		1.6		1.0
Public Real Assets		2.0		2.4
Fixed Income		40.0		36.7
Cash Equivalents		1.3		0.9
Total		100.0		100.0

Plan assets using the fair value hierarchy

	Total		Level 1		Level 2		Level 3
	(In Millions)
Asset Class:
U.S. Equity	$	139	$	53	$	20	$	66
Global ex U.S. Equity		104		—		104		—
Emerging Markets Equity		36		—		36		—
Absolute Return Hedge Funds		117		—		37		80
Equity Hedge Funds		107		—		57		50
Private Equity		47		—		—		47
Private Real Assets		16		—		—		16
Public Real Assets		20		—		11		9
Fixed Income		399		399		—		—
Cash Equivalents		13		—		13		—
Total	$	998	$	452	$	278	$	268

	Total		Level 1		Level 2		Level 3
	(In Millions)
Asset Class:
U.S. Equity	$	150	$	47	$	30	$	73
Global ex U.S. Equity		115		—		115		—
Emerging Markets Equity		35		—		35		—
Absolute Return Hedge Funds		116		—		29		87
Equity Hedge Funds		127		—		64		63
Private Equity		41		—		—		41
Private Real Assets		10		—		—		10
Public Real Assets		24		—		12		12
Fixed Income		363		363		—		—
Cash Equivalents		8		—		8		—
Total	$	989	$	410	$	293	$	286

Reconciliation of Level 3 assets held during the year

	January 1, 2011 Balance		Net Realized Unrealized Gains/ (Losses)			Net Purchases and Settlements			Net Transfers Into/(Out of) Level 3		December  31, 2011 Balance
US Equity	$	73	$	5		$	(12	)	$	—	$	66
Absolute Return Hedge Funds		87		1			(8	)		—		80
Equity Hedge Funds		63		(4	)		(9	)		—		50
Private Equity		41		6			—			—		47
Private Real Assets		10		1			5			—		16
Public Real Assets		12		(3	)		—			—		9

	January 1, 2010 Balance		Net Realized Unrealized Gains/ (Losses)		Net Purchases and Settlements			Net Transfers Into/(Out of) Level 3			December  31, 2010 Balance
US Equity		31		11		7			24			73
Absolute Return Hedge Funds		81		11		(5	)		—			87
Equity Hedge Funds		58		2		3			—			63
Private Equity		62		4		(1	)		(24	)		41
Private Real Assets		7		1		2			—			10
Public Real Assets		—		2		10			—			12