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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2013
Fair Value Measurements (Tables) [Abstract]  
Summary of financial instruments recognized at fair value and fair value measurement used
A summary of financial instruments recognized at fair value, and the fair value measurements used, follows:
 
Total
 
Quoted prices
in active
markets for
identical assets
(Level 1)
 
Other
observable
inputs
(Level 2)
 
Unobservable
inputs
(Level 3)
March 31, 2013
 
 
 
 
 
 
 
Cash
$
639

 
$
639

 
$

 
$

Short-term investments
397

 
397

 

 

Net derivative contracts
73

 

 
73

 

Long-term debt converted to floating interest rates by
   interest rate swaps - net
79

 

 
79

 

 
 
 
 
 
 
 
 
December 31, 2012
 
 
 
 
 
 
 
Cash
$
577

 
$
577

 
$

 
$

Short-term investments
527

 
527

 

 

Net derivative contracts
83

 

 
83

 

Long-term debt converted to floating interest rates by
   interest rate swaps - net
87

 

 
87