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Fair Value Measurements Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2013
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, 2013 and December 31, 2012 are in the following table:
 
 
 
 
 
 
Fair Value
 
 
Total Cost Basis
 
Level 1
 
Level 2
 
Total
 Millions of dollars
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Money market funds (1)
 
$
97

 
$
563

 
$
97

 
$
563

 
$

 
$

 
$
97

 
$
563

Net derivative contracts
 

 

 

 

 
2

 
(14
)
 
2

 
(14
)
Available for sale investments
 
7

 
7

 
11

 
10

 

 

 
11

 
10

(1) Money market funds are primarily comprised of government obligations.