Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2017

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost

The components of net periodic benefit cost for the three- and nine-month periods ended September 30, 2017 and 2016, were as follows:

	Millions of Dollars
	Pension Benefits									Other Benefits
	2017					2016				2017		2016
	U.S.			Int’l.		U.S.		Int’l.
Components of Net Periodic Benefit Cost
Three Months Ended September 30
Service cost	$	33		8		32		8		1		1
Interest cost	27			7		29		7		2		2
Expected return on plan assets	(37		)	(11	)	(32	)	(9	)	—		—
Amortization of prior service cost	1			—		1		—		—		—
Recognized net actuarial loss	17			6		18		4		—		—
Settlements	21			—		2		—		—		—
Net periodic benefit cost	$	62		10		50		10		3		3
Nine Months Ended September 30
Service cost	$	99		25		96		26		4		5
Interest cost	81			20		87		22		6		6
Expected return on plan assets	(110		)	(30	)	(96	)	(29	)	—		—
Amortization of prior service cost (credit)	2			(1	)	2		(1	)	(1	)	(1	)
Recognized net actuarial loss	52			18		54		11		—		—
Settlements	76			—		5		—		—		—
Net periodic benefit cost	$	200		32		148		29		9		10