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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2015
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis
Assets and liabilities measured at fair value on a recurring basis at June 30, 2015 and December 31, 2014 are in the following table:
 
 
 
 
 
 
Fair Value
 
 
Total Cost Basis
 
Level 1
 
Level 2
 
Total
Millions of dollars
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Money market funds (1)
 
$
13

 
$
21

 
$
13

 
$
21

 
$
—

 
$
—

 
$
13

 
$
21

Net derivative contracts
 
—

 
—

 
—

 
—

 
(30
)
 
(1
)
 
(30
)
 
(1
)
Available for sale investments
 
12

 
16

 
25

 
26

 
—

 
—

 
25

 
26

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