Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2015

Employee Benefits

Schedule of Plans' assets measured at estimated fair value

	Balance
	December 31,
(Millions of dollars)	2015		Level 1		Level 2		Level 3
Assets:
Domestic equity securities	$	64	$	64	$	—	$	—
Foreign equity securities		27		27		—		—
Real estate mutual fund		8		8		—		—
Fixed income mutual funds		5		5		—		—
Commodity mutual funds		2		2		—		—
Money market funds		2		2		—		—
International fixed income mutual funds		1		1		—		—
Other		5		—		5		—
Total Assets	$	114	$	109	$	5	$	—

	Balance
	December 31,
(Millions of dollars)	2014		Level 1		Level 2		Level 3
Assets:
Domestic equity securities	$	67	$	67	$	—	$	—
Foreign equity securities		28		28		—		—
Real estate mutual fund		9		9		—		—
Fixed income mutual funds		4		4		—		—
Commodity mutual funds		4		4		—		—
International fixed income mutual funds		3		3		—		—
Money market funds		2		2		—		—
Other		5		—		5		—
Total Assets	$	122	$	117	$	5	$	—

Schedule of assumptions used in determining pension information for plans

	Years ended December 31,
	2015				2014				2013
Weighted-average assumptions
Discount rate used to determine obligations	3.20	-	4.80	%	3.15	-	4.40	%	3.55	-	5.20	%
Discount rate used to determine net periodic benefit cost	2.70	-	4.40	%	3.55	-	5.20	%	2.50	-	4.15	%
Expected return on plan assets	6.75	-	7.50	%	7.00	-	8.00	%	6.50	-	7.25	%
Long-term rate of increase in compensation levels			4.00	%			4.00	%			4.00	%

Schedule of the funded status

	December 31,
(Millions of dollars)	2015		2014
Reconciliation of benefit obligation:
Benefit obligation at beginning of year	$	257	$	203
Service cost		10		8
Interest cost		10		10
Actuarial losses (gains)		(18)		44
Benefits paid		(8)		(7)
Other		(2)		(1)
Benefit obligation at end of year	$	249	$	257
Reconciliation of fair value of plan assets:
Fair value of plan assets at beginning of year	$	122	$	120
Actual return on plan assets		(4)		7
Employer contributions		4		3
Benefits paid		(8)		(7)
Other		—		(1)
Fair value of plan assets at end of year	$	114	$	122
Funded status	$	(135)	$	(135)

Schedule of net periodic benefit cost of plans

	Years ended December 31,
(Millions of dollars)	2015		2014		2013
Components of net periodic benefit cost:
Service cost	$	10	$	8	$	9
Interest cost		10		10		8
Expected return on plan assets		(8)		(9)		(6)
Amortization and other		5		2		6
Agreement termination gain		(1)		—		(3)
Net periodic benefit cost	$	16	$	11	$	14