Pension and Other Postretirement Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2011

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

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

Obligations and Funded Status at End of Year

Schedule of Accumulated and Projected Benefit Obligations [Table Text Block]



	United States Pension Benefits						Foreign Pension Benefits						Other Postretirement Benefits
Millions of dollars	2011			2010			2011			2010			2011			2010
Funded status
Fair value of plan assets	$	2,573		$	2,288		$	170		$	172		$	—		$	—
Benefit obligations	3,872			3,605			373			389			488			671
Funded status	$	(1,299	)	$	(1,317	)	$	(203	)	$	(217	)	$	(488	)	$	(671	)
Amounts recognized in the statement of financial position
Noncurrent asset	$	—		$	—		$	5		$	5		$	—		$	—
Current liability	(8		)	(7		)	(12		)	(13		)	(58		)	(61		)
Noncurrent liability	(1,291		)	(1,310		)	(196		)	(209		)	(430		)	(610		)
Amount recognized	$	(1,299	)	$	(1,317	)	$	(203	)	$	(217	)	$	(488	)	$	(671	)
Amounts recognized in accumulated other comprehensive income (pre-tax)
Net actuarial loss (gain)	$	1,510		$	1,255		$	65		$	68		$	(1	)	$	2
Prior service (credit) cost	(23		)	(27		)	5			5			(296		)	(224		)
Transition (asset) obligation	—			—			(1		)	(1		)	1			1
Amount recognized	$	1,487		$	1,228		$	69		$	72		$	(296	)	$	(221	)

Change in Benefit Obligation

Schedule of Changes in Fair Value of Plan Assets [Table Text Block]

Change in Plan Assets

Schedule of Net Benefit Costs [Table Text Block]



	United States Pension Benefits						Foreign Pension Benefits						Other Postretirement Benefits
Millions of dollars	2011			2010			2011			2010			2011			2010
Fair value of plan assets, beginning of year	$	2,288		$	2,273		$	172		$	179		$	—		$	—
Actual return on plan assets	227			266			5			10			—			—
Employer contribution	303			41			25			26			64			57
Plan participants’ contributions	—			—			2			2			10			17
Gross benefits paid	(245		)	(292		)	(31		)	(45		)	(74		)	(74		)
Settlements	—			—			—			(1		)	—			—
Foreign currency exchange rates	—			—			(3		)	1			—			—
Fair value of plan assets, end of year	$	2,573		$	2,288		$	170		$	172		$	—		$	—

Components of Net Periodic Benefit Cost

Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Pre-Tax) in 2011

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]



Millions of dollars	United States Pension Benefits			Foreign Pension Benefits			Other Postretirement Benefits
Current year actuarial (gain) loss	$	285		$	4		$	(6	)
Actuarial (loss) gain recognized during the year	(31		)	(6		)	2
Current year prior service cost (credit)	—			—			(148		)
Prior service credit (cost) recognized during the year	3			(1		)	75
Total recognized in other comprehensive income (pre-tax)	$	257		$	(3	)	$	(77	)
Total recognized in net periodic benefit costs and other comprehensive income (pre-tax)	$	285		$	21		$	(115	)

Estimated Pre-Tax Amounts that will be amortized from Accumulated Other Comprehensive Income into Net Periodic Pension Cost in 2012

Schedule of Assumptions Used [Table Text Block]

Weighted-average assumptions used to determine benefit obligation at end of year

ScheduleOfAssumptionsUsedNetPeriodicCost [Table Text Block]



	United States Pension Benefits				Foreign Pension Benefits				Other Postretirement Benefits
	2011		2010		2011		2010		2011		2010
Discount rate	4.80	%	5.60	%	5.00	%	5.20	%	4.80	%	5.55	%
Rate of compensation increase	4.50	%	4.50	%	3.50	%	3.50	%	—		—

Weighted-average assumptions used to determine net periodic cost

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]

Expected Employer Contributions to Funded Plans [Table Text Block]

Expected Employer Contributions to Funded Plans



Millions of dollars	United States Pension Benefits⁽¹⁾		Foreign Pension Benefits
2012	$	220	$	11

Schedule of Expected Benefit Payments [Table Text Block]



¹	Contributions include $180 million of minimum contributions required by law.

Expected Benefit Payments

Schedule of Allocation of Plan Assets [Table Text Block]

s. We manage the process and approve the results of a third party pricing service to value the majority of our securities and to determine the appropriate level in the fair value hierarchy. The fair values of our pension plan assets at December 31, 2011 and 2010, by asset category were as follows:



	December 31,
Millions of dollars	Quoted prices (Level 1)				Other significant observable inputs (Level 2)				Significant unobservable inputs (Level 3)				Total
	2011		2010		2011		2010		2011		2010		2011		2010
Cash and cash equivalents	$	1	$	6			$	—	$	—	$	—	$	1	$	6
Government and government agency securities^(a)
U.S. securities	—		—		432		394		—		—		432		394
International securities	—		—		50		17		—		—		50		17
Corporate bonds and notes ^(a)
U.S. companies	—		—		692		387		—		—		692		387
International companies	—		—		212		131		—		—		212		131
Equity securities ^(b)
U.S. companies	181		215		—		—		—		—		181		215
International companies	57		79		—		—		—		—		57		79
Mutual funds ^(c)	90		118		—		—		—		—		90		118
Common and collective funds ^(d)
U.S. equity securities	—		—		517		555		—		—		517		555
International equity securities	—		—		245		319		—		—		245		319
Short-term investment fund	—		—		52		34		—		—		52		34
Limited partnerships ^(e)
U.S. private equity investments	—		—		—		—		137		116		137		116
Diversified fund of funds	—		—		—		—		42		41		42		41
Emerging growth	—		—		—		—		14		17		14		17
Real estate ^(f)	—		—		10		9		—		—		10		9
All other investments	—		—		11		22		—		—		11		22
	$	329	$	418	$	2,221	$	1,868	$	193	$	174	$	2,743	$	2,460


(a)	Valued using pricing vendors who use proprietary models to estimate the price a dealer would pay to buy a security using significant observable inputs, such as interest rates, yield curves, and credit risk.


(b)	Valued using the closing stock price on a national securities exchange, which reflects the last reported sales price on the last business day of the year.


(c)	Valued using the net asset value (NAV) of the fund, which is based on the fair value of underlying securities. The fund primarily invests in a diversified portfolio of equity securities issued by non-U.S. companies.


(d)	Valued using the NAV of the fund, which is based on the fair value of underlying securities.


(e)	Valued at estimated fair value based on the proportionate share of the limited partnerships fair value, as determined by the general partner.


(f)	Valued using the NAV of the fund, which is based on the fair value of underlying securities.

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Fair Value Measurements Using Significant Unobservable Inputs (Level 3)

Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

The projected benefit obligation and fair value of plan assets for pension plans with a projected benefit obligation in excess of plan assets at December 31, 2011 and 2010 were as follows:

Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]



	United States Pension Benefits				Foreign Pension Benefits
Millions of dollars	2011		2010		2011		2010
Projected benefit obligation	$	3,872	$	3,605	$	297	$	276
Fair value of plan assets	2,573		2,288		89		53

The projected benefit obligation, accumulated benefit obligation and fair value of plan assets for pension plans with an accumulated benefit obligation in excess of plan assets at December 31, 2011 and 2010 were as follows:



	United States Pension Benefits				Foreign Pension Benefits
Millions of dollars	2011		2010		2011		2010
Projected benefit obligation	$	3,872	$	3,605	$	253	$	253
Accumulated benefit obligation	3,859		3,594		241		244
Fair value of plan assets	2,573		2,288		48		45