XML 39 R20.htm IDEA: XBRL DOCUMENT v3.8.0.1
Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2017
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis
Assets and liabilities measured at fair value on a recurring basis at September 30, 2017 and December 31, 2016 are as follows:






Fair Value


Total Cost Basis

Level 1

Level 2

Total
Millions of dollars

2017

2016

2017

2016

2017

2016

2017

2016
Money market funds(1)

$
32


$
29


$
32


$
29


$
—


$
—


$
32


$
29

Net derivative contracts

—


—


—


—


(84
)

41


(84
)

41

Available for sale investments

6


4


23


16


—


—


23


16

(1)Money market funds are comprised primarily of government obligations and other first tier obligations.