Pension and Other Postretirement 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 following table summarizes the components of net periodic pension cost and the cost of other postretirement benefits for the periods presented:

	Three Months Ended June 30,
	United States Pension Benefits						Foreign Pension Benefits						Other Postretirement Benefits
Millions of dollars	2012			2011			2012			2011			2012			2011
Service cost	$	1		$	—		$	1		$	2		$	2		$	2
Interest cost	44			48			5			5			5			8
Expected return on plan assets	(49		)	(48		)	(3		)	(3		)	—			—
Amortization:
Actuarial loss	12			8			1			1			—			—
Prior service credit	(1		)	(1		)	—			—			(11		)	(11		)
Settlement and curtailment (gain) loss	2			—			—			—			(49		)	—
Net periodic benefit cost (credit)	$	9		$	7		$	4		$	5		$	(53	)	$	(1	)

	Six Months Ended June 30,
	United States Pension Benefits						Foreign Pension Benefits						Other Postretirement Benefits
Millions of dollars	2012			2011			2012			2011			2012			2011
Service cost	$	1		$	—		$	3		$	4		$	3		$	4
Interest cost	89			96			9			10			11			17
Expected return on plan assets	(97		)	(96		)	(5		)	(6		)	—			—
Amortization:
Actuarial loss	23			16			2			2			—			—
Prior service credit	(2		)	(2		)	—			—			(23		)	(18		)
Settlement and curtailment (gain) loss	4			—			—			—			(49		)	—
Net periodic benefit cost (credit)	$	18		$	14		$	9		$	10		$	(58	)	$	3