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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2014
Fair Value Measurements [Abstract]  
Fair Value, Assets Measured on Recurring Basis
Assets and liabilities measured at fair value on a recurring basis at March 31, 2014 and December 31, 2013 are in the following table:
 
 
 
 
 
 
Fair Value
 
 
Total Cost Basis
 
Level 1
 
Level 2
 
Total
 Millions of dollars
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Money market funds (1)
 
$
736

 
$
465

 
$
736

 
$
465

 
$

 
$

 
$
736

 
$
465

Net derivative contracts
 

 

 

 

 
6

 
(25
)
 
6

 
(25
)
Available for sale investments
 
21

 
8

 
43

 
18

 

 

 
43

 
18

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