Pension and Other Postretirement Benefit Plans (Tables)

3 Months Ended

6 Months Ended

Jun. 30, 2011

Jun. 30, 2011

Pension and Other Postretirement Benefit Plans [Abstract]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

	Three months ended June 30,
	United States Pension Benefits						Foreign Pension Benefits						Other Postretirement Benefits
Millions of dollars	2011			2010			2011			2010			2011			2010
Service cost	$	—		$	1		$	2		$	1		$	2		$	3
Interest cost	48			50			5			5			8			10
Expected return on plan assets	(48		)	(47		)	(3		)	(2		)	—			—
Amortization:
Actuarial loss	8			7			1			1			—			—
Prior service credit	(1		)	(1		)	—			—			(11		)	(8		)
Settlement and curtailment (gain) loss	—			—			—			—			—			(33		)
Net periodic benefit cost (credit)	$	7		$	10		$	5		$	5		$	(1	)	$	(28	)

	Six months ended June 30,
	United States Pension Benefits						Foreign Pension Benefits						Other Postretirement Benefits
Millions of dollars	2011			2010			2011			2010			2011			2010
Service cost	$	—		$	1		$	4		$	3		$	4		$	5
Interest cost	96			100			10			10			17			20
Expected return on plan assets	(96		)	(95		)	(6		)	(5		)	—			—
Amortization:
Actuarial loss	16			15			2			1			—			—
Prior service credit	(2		)	(1		)	—			—			(18		)	(17		)
Settlement and curtailment (gain) loss	—			—			—			1			—			(62		)
Net periodic benefit cost (credit)	$	14		$	20		$	10		$	10		$	3		$	(54	)