Pension and Other Postretirement Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2015

General Discussion of Pension and Other Postretirement Benefits [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	2015			2014			2015			2014			2015			2014
Service cost	$	—		$	1		$	2		$	2		$	—		$	—
Interest cost	37			42			7			5			5			6
Expected return on plan assets	(47		)	(48		)	(9		)	(3		)	—			—
Amortization:
Actuarial loss	14			10			2			1			—			—
Prior service credit	(1		)	(1		)	—			—			(5		)	(9		)
Settlement and curtailment loss	—			—			4			2			—			—
Net periodic benefit cost (credit)	$	3		$	4		$	6		$	7		$	—		$	(3	)

	Six Months Ended June 30,
	United States Pension Benefits						Foreign Pension Benefits						Other Postretirement Benefits
Millions of dollars	2015			2014			2015			2014			2015			2014
Service cost	$	1		$	1		$	3		$	3		$	1		$	1
Interest cost	75			84			15			9			10			12
Expected return on plan assets	(95		)	(96		)	(17		)	(6		)	—			—
Amortization:
Actuarial loss	27			21			3			3			—			—
Prior service credit	(2		)	(2		)	—			—			(14		)	(19		)
Settlement and curtailment (gain) loss	—			—			12			2			(47		)	—
Net periodic benefit cost (credit)	$	6		$	8		$	16		$	11		$	(50	)	$	(6	)