Restructuring Costs (Tables)

6 Months Ended

Jun. 30, 2016

Restructuring Charges [Abstract]

Restructuring and related costs

Restructuring costs for the three and six months ended June 30, 2016 and 2015 were as follows:

(Millions of dollars)	Three Months Ended June 30
	2016		2015
Employee separations 1	$	45	$	86
Contract terminations 1	36		—
Long-lived asset impairments 1	14		—
Other 2	44		—
Total restructuring costs	$	139	$	86
	Six Months Ended June 30
	2016		2015
Employee separations 1	$	76	$	120
Contract terminations 1	46		—
Long-lived asset impairments 1	96		1
Other 2	82		—
Total restructuring costs	$	300	$	121
1 Recognized in Other operating (income) expenses.
2 Represents costs related to our restructuring programs, primarily for accelerated depreciation, equipment relocation and inventory write-downs and were recognized primarily in Cost of goods sold.

Summary of separation activity

The following table summarizes the 2015 and 2016 employee separation activity:

(Millions of dollars)	Total
Liability balance at December 31, 2014	$	182
Increase in liability (separation charges)	641
Reduction in liability (payments)	(340		)
Liability balance at December 31, 2015	$	483
Increase in liability (separation charges)	76
Reduction in liability (payments)	(440		)
Liability balance at June 30, 2016	$	119