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Employee Separation Charges (Tables)
 3 Months Ended
Mar. 31, 2016
Restructuring and Related Activities [Abstract]  
Summary of separation activity
The following table summarizes the 2015 and 2016 separation activity:
(Millions of dollars)
 
Liability balance at December 31, 2014
$
—

Increase in liability (separation charges)
15

Reduction in liability (payments)
(5
)
Liability balance at December 31, 2015
$
10

Increase in liability (separation charges)
—

Reduction in liability (payments)
(10
)
Liability balance at March 31, 2016
$
—