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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2016
Fair Value Disclosures [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)
2016
 
 
 
 
 
 
 
Cash
$
543

 
$
543

 
$
—

 
$
—

Short-term investments
203

 
203

 
—

 
—

Net derivative contracts
(3
)
 
—

 
(3
)
 
—

Long-term debt converted to floating interest rates by
   interest rate swaps - net
(58
)
 
—

 
(58
)
 
—

 
 
 
 
 
 
 
 
2015
 
 
 
 
 
 
 
Cash
$
268

 
$
268

 
$
—

 
$
—

Short-term investments
177

 
177

 
—

 
—

Net derivative contracts
86

 
—

 
86

 
—

Long-term debt converted to floating interest rates by
   interest rate swaps - net
(94
)
 
—

 
(94
)
 
—
Summary of carrying value of short-term investments
A summary of the carrying value of short-term investments follows:
 
2016
 
2015
Time deposits, certificates of deposit and demand deposits with banks
$
149

 
$
122

Money market investments
54

 
55

Total short-term investments
$
203

 
$
177