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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2016
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, 2016 and December 31, 2015 are in the following table:






Fair Value


Total Cost Basis

Level 1

Level 2

Total
Millions of dollars

2016

2015

2016

2015

2016

2015

2016

2015
Money market funds(1)

$
9


$
13


$
9


$
13


$
—


$
—


$
9


$
13

Net derivative contracts

—


—


—


—


19


(42
)

19


(42
)
Available for sale investments

12


11


21


25


—


—


21


25

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