Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2011

Retirement Plans [Abstract]

Components of net periodic benefit cost and other amounts recognized in OCI

	Pension Benefits									Postretirement Benefits Other than Pensions
(In millions)	2011			2010			2009			2011			2010			2009
Net periodic benefit cost
Service cost	$	129		$	124		$	116		$	8		$	8		$	8
Interest cost		327			328			323			33			34			38
Expected return on plan assets		(393	)		(385	)		(404	)		—			—			—
Amortization of prior service cost (credit)		16			16			18			(8	)		(4	)		(5)
Amortization of net loss		75			41			10			11			11			8
Curtailment and special termination charges		(1	)		2			34			—			—			(5)
Net periodic benefit cost	$	153		$	126		$	97		$	44		$	49		$	44
Other changes in plan assets and benefit obligations recognized in OCI, including foreign exchange
Amortization of net loss	$	(75	)	$	(41	)	$	(10	)	$	(11	)	$	(11	)	$	(8)
Net loss (gain) arising during the year		556			171			(58	)		(17	)		—			24
Amortization of prior service credit (cost)		(16	)		(16	)		(48	)		8			4			10
Prior service cost (credit) arising during the year		7			5			26			(23	)		(16	)		2
Curtailments and settlements		1			(1	)		—			—			—			—
Total recognized in OCI	$	473		$	118		$	(90	)	$	(43	)	$	(23	)	$	28
Total recognized in net periodic benefit cost and OCI	$	626		$	244		$	7		$	1		$	26		$	72

Amortized amount from accumulated other comprehensive income

(In millions)	Pension Benefits		Postretirement   Benefits   Other than   Pensions
Net loss	$	117	$	7
Prior service cost (credit)		16		(11)
	$	133	$	(4)

Changes in the projected benefit obligation and in the fair value of plan assets

	Pension Benefits						Postretirement Benefits Other than Pensions
(In millions)	2011			2010			2011			2010
Change in benefit obligation
Benefit obligation at beginning of year	$	5,877		$	5,470		$	614		$	646
Service cost		129			124			8			8
Interest cost		327			328			33			34
Amendments		7			5			(23	)		(16)
Plan participants’ contributions		—			—			5			5
Actuarial losses (gains)		331			292			(17	)		—
Benefits paid		(339	)		(330	)		(59	)		(63)
Foreign exchange rate changes		(7	)		(10	)		—			—
Curtailments		—			(2	)		—			—
Benefit obligation at end of year	$	6,325		$	5,877		$	561		$	614
Change in fair value of plan assets
Fair value of plan assets at beginning of year	$	4,559		$	4,005
Actual return on plan assets		167			505
Employer contributions		628			390
Benefits paid		(339	)		(330	)
Foreign exchange rate changes		(3	)		(9	)
Settlements and disbursements		1			(2	)
Fair value of plan assets at end of year	$	5,013		$	4,559
Funded status at end of year	$	(1,312	)	$	(1,318	)	$	(561	)	$	(614)

Amounts recognized in our balance sheets

	Pension Benefits						Postretirement Benefits Other than Pensions
(In millions)	2011			2010			2011			2010
Non-current assets	$	54		$	58		$	—		$	—
Current liabilities		(23	)		(22	)		(56	)		(60)
Non-current liabilities		(1,343	)		(1,354	)		(505	)		(554)
Recognized in Accumulated other comprehensive loss, pre-tax:
Net loss		2,455			1,977			91			120
Prior service cost (credit)		129			138			(50	)		(35)

Pension plans with accumulated benefit obligations exceeding the fair value of plan assets

(In millions)	2011		2010
Projected benefit obligation	$	6,153	$	5,706
Accumulated benefit obligation		5,784		5,288
Fair value of plan assets		4,786		4,329

Weighted-average assumptions used for pension and postretirement plans

	Pension Benefits						Postretirement Benefits Other than Pensions
	2011		2010		2009		2011		2010		2009
Net periodic benefit cost
Discount rate		5.71%		6.20%		6.61%		5.50%		5.50%		6.25%
Expected long-term rate of return on assets		7.84%		8.26%		8.58%
Rate of compensation increase		3.99%		4.00%		4.36%
Benefit obligations at year-end
Discount rate		4.95%		5.71%		6.19%		4.75%		5.50%		5.50%
Rate of compensation increases		3.49%		3.99%		4.00%

Assumed healthcare cost trend rates

	2011		2010
Medical cost trend rate		9%		8%
Prescription drug cost trend rate		9%		9%
Rate to which medical and prescription drug cost trend rates will gradually decline		5%		5%
Year that the rates reach the rate where we assume they will remain		2021		2020

Effects of one-percentage-point change in assumed healthcare cost trend rates

(In millions)	One- Percentage- Point Increase		One-  Percentage-  Point  Decrease
Effect on total of service and interest cost components	$	4	$	(3)
Effect on postretirement benefit obligations other than pensions		40		(35)

Target allocation ranges

U.S. Plan Assets
Domestic equity securities	27 % to 41%
International equity securities	11% to 22%
Debt securities	26% to 34%
Private equity partnerships	5% to 11%
Real estate	9% to 15%
Hedge funds	0% to   7%
Foreign Plan Assets
Equity securities	25% to 70%
Debt securities	30% to 60%
Real estate	3% to 17%

Fair value of total pension plan assets

	December 31, 2011						January 1, 2011
(In millions)	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
Cash and equivalents	$	14	$	183	$	—	$	3	$	178	$	—
Equity securities:
Domestic		1,017		482		—		1,052		469		—
International		777		233		—		688		251		—
Debt securities:
National, state and local governments		630		254		—		39		570		—
Corporate debt		34		494		—		10		432		—
Asset-backed securities		3		74		—		2		103		—
Private equity partnerships		—		—		314		—		—		324
Real estate		—		—		407		—		—		337
Hedge funds		—		—		97		—		—		101
Total	$	2,475	$	1,720	$	818	$	1,794	$	2,003	$	762

Reconciliation for fair value measurements that use significant unobservable inputs

(In millions)	Hedge Funds			Private Equity Partnerships			Real Estate
Balance at beginning of year	$	101		$	324		$	337
Actual return on plan assets:
Related to assets still held at reporting date		(4	)		7			32
Related to assets sold during the period		—			31			2
Purchases, sales and settlements, net		—			(48	)		36
Balance at end of year	$	97		$	314		$	407

Estimated future benefit payments which reflect expected future service to be paid by the plans

(In millions)	2012			2013			2014		2015		2016		2017-2012
Pension benefits	$	340		$	347		$	352	$	358	$	365	$	1,957
Post-retirement benefits other than pensions		58			55			54		52		50		214
Expected Medicare Part D Subsidy		(2	)		(1	)		—		—		—		(1)