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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2013
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]  
Assets and Liabilities Measured at Fair Value on a Recurring Basis
Assets and liabilities measured at fair value on a recurring basis at December 31, 2013 and 2012 are as follows:
 
 
Total Cost Basis
 
Quoted Prices In
Active Markets for
Identical Assets
(Level 1)
 
Significant Other
Observable Inputs
(Level 2)
 
Total Fair Value
 Millions of dollars
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Money market funds (1)
 
$
465

 
$
563

 
$
465

 
$
563

 
$
—

 
$
—

 
$
465

 
$
563

Net derivative contracts
 
—

 
—

 
—

 
—

 
(25
)
 
(14
)
 
(25
)
 
(14
)
Available for sale investments
 
8

 
7

 
18

 
10

 
—

 
—

 
18

 
10

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