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Marketable Securities
 9 Months Ended
Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Marketable Securities

 
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
 
(In millions)
September 30, 2016
 
 
 
 
 
 
 
United States government obligations
 
 
 
 
 
 
 
Maturity less than 1 year
$
253

 
$
—

 
$
—

 
$
253

Maturity 1 to 5 years
115

 
—

 
—

 
115

Corporate debt securities
 

 
 

 
 

 
 

Maturity less than 1 year
2

 
—

 
—

 
2

Maturity 1 to 5 years
67

 
2

 
—

 
69

Other debt securities
 

 
 

 
 

 
 

Maturity less than 1 year
1

 
—

 
—

 
1

Equity securities
 
 
 

 
 

 
 

Available-for-sale
301

 
—

 
(23
)
 
278

 
$
739

 
$
2

 
$
(23
)
 
$
718


 
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
 
(In millions)
December 31, 2015
 
 
 
 
 
 
 
United States government obligations
 
 
 
 
 
 
 
Maturity less than 1 year
$
256

 
$
—

 
$
—

 
$
256

Maturity 1 to 5 years
116

 
—

 
—

 
116

Corporate debt securities
 

 
 

 
 

 
 

Maturity 1 to 5 years
26

 
—

 
—

 
26

Other debt securities
 

 
 

 
 

 
 

Maturity less than 1 year
182

 
—

 
—

 
182

Maturity 1 to 5 years
3

 
—

 
—

 
3

Equity securities
 

 
 

 
 

 
 

Available-for-sale
296

 
4

 
(6
)
 
294

 
$
879

 
$
4

 
$
(6
)
 
$
877



The $23 million in unrealized losses at September 30, 2016 arose within the last 12 months and is related to the Company’s investment in one available-for-sale equity security with a fair value of $296 million. The Company evaluated the near-term prospects of the issuer in relation to the severity and duration of the impairment.  Based on that evaluation and the Company’s ability and intent to hold this investment for a reasonable period of time sufficient for a forecasted recovery of fair value, the Company does not consider this investment to be other-than-temporarily impaired at September 30, 2016.

For information on other-than temporary impairment charges, see Note 15.