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Marketable Securities
 9 Months Ended
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Marketable Securities

 
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
 
(In millions)
 
 
 
 
 
 
 
 
September 30, 2015
 
 
 
 
 
 
 
United States government obligations
 
 
 
 
 
 
 
Maturity less than 1 year
$
365

 
$
—

 
$
—

 
$
365

Maturity 1 to 5 years
108

 
1

 
—

 
109

Corporate debt securities
 

 
 

 
 

 
 

Maturity 1 to 5 years
26

 
—

 
—

 
26

Other debt securities
 

 
 

 
 

 
 

Maturity less than 1 year
52

 
—

 
—

 
52

Maturity 1 to 5 years
3

 
—

 
—

 
3

Equity securities
 
 
 

 
 

 
 

Available-for-sale
283

 
19

 
(4
)
 
298

 
$
837

 
$
20

 
$
(4
)
 
$
853


 
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
 
(In millions)
 
 
 
 
 
 
 
 
December 31, 2014
 
 
 
 
 
 
 
United States government obligations
 
 
 
 
 
 
 
Maturity less than 1 year
$
385

 
$
—

 
$
—

 
$
385

Maturity 1 to 5 years
93

 
—

 
—

 
93

Corporate debt securities
 

 
 

 
 

 
 

Maturity 1 to 5 years
72

 
—

 
—

 
72

Other debt securities
 

 
 

 
 

 
 

Maturity less than 1 year
130

 
—

 
—

 
130

Maturity 1 to 5 years
3

 
—

 
—

 
3

Equity securities
 

 
 

 
 

 
 

Available-for-sale
328

 
1

 
(12
)
 
317

 
$
1,011

 
$
1

 
$
(12
)
 
$
1,000



The $4 million in unrealized losses at September 30, 2015 is related to the Company’s investment in one available-for-sale equity security that has been in an unrealized loss position for 12 months or longer with a fair value of $2 million. The Company evaluated the near-term prospects of the issuers in relation to the severity and duration of the impairment.  Based on that evaluation and the Company’s ability and intent to hold these investments for a reasonable period of time sufficient for a forecasted recovery of fair value, the Company does not consider these investments to be other-than-temporarily impaired at September 30, 2015.