Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2017

Employee Benefits

Schedule of Plans' assets measured at estimated fair value

	Balance
	December 31,
(Millions of dollars)	2017		Level 1		Level 2		Level 3
Assets:
Domestic equity securities	$	80	$	80	$	—	$	—
Foreign equity securities		53		53		—		—
Domestic fixed income mutual funds		25		25		—		—
Money market funds		2		2		—		—
Foreign fixed income mutual funds		11		11		—		—
Total Assets	$	171	$	171	$	—	$	—

	Balance
	December 31,
(Millions of dollars)	2016		Level 1		Level 2		Level 3
Assets:
Domestic equity securities	$	76	$	76	$	—	$	—
Foreign equity securities		35		35		—		—
Domestic fixed income mutual funds		17		17		—		—
Real estate mutual fund		8		8		—		—
Commodity mutual funds		4		4		—		—
Money market funds		4		4		—		—
Foreign fixed income mutual funds		2		2		—		—
Other		5		—		5		—
Total Assets	$	151	$	146	$	5	$	—

Schedule of assumptions used in determining pension information for plans

	Years ended December 31,
	2017				2016				2015
Weighted average assumptions
Discount rate used to determine obligations	2.75	-	3.80	%	2.90	-	4.65	%	3.20	-	4.80	%
Discount rate used to determine net periodic benefit cost	2.90	-	4.60	%	3.20	-	4.80	%	2.70	-	4.40	%
Expected return on plan assets			6.50	%	6.75	-	7.00	%	6.75	-	7.50	%
Long-term rate of increase in compensation levels			4.00	%			4.00	%			4.00	%

Schedule of the funded status

	December 31,
	2017		2016
(Millions of dollars)	Accumulated benefits exceed assets		Assets exceed accumulated benefits		Accumulated benefits exceed assets		Total
Reconciliation of benefit obligation:
Benefit obligation at beginning of year	$	262	$	70	$	179	$	249
Service cost		9		4		5		9
Interest cost		11		3		8		11
Actuarial losses		29		—		6		6
Plan settlements		(9)		—		—		—
Benefits paid		(3)		(4)		(9)		(13)
Other		1		—		—		—
Benefit obligation at end of year	$	300	$	73	$	189	$	262
Reconciliation of fair value of plan assets:
Fair value of plan assets at beginning of year	$	151	$	46	$	68	$	114
Actual return on plan assets		25		6		4		10
Employer contributions		10		39		1		40
Plan settlements		(9)		—		—		—
Benefits paid		(6)		(4)		(9)		(13)
Fair value of plan assets at end of year	$	171	$	87	$	64	$	151
Funded status	$	(129)	$	14	$	(125)	$	(111)

Schedule of net periodic benefit cost of plans

	Years ended December 31,
(Millions of dollars)	2017		2016		2015
Components of net periodic benefit cost:
Service cost	$	9	$	9	$	10
Interest cost		11		11		10
Expected return on plan assets		(10)		(8)		(8)
Amortization and other		5		5		5
Settlement loss recognized		2		—		—
Agreement termination gain		—		—		(1)
Net periodic benefit cost	$	17	$	17	$	16