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Marketable Securities
 6 Months Ended
Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Marketable Securities

 
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
 
(In millions)
 
 
 
 
 
 
 
 
June 30, 2015
 
 
 
 
 
 
 
United States government obligations
 
 
 
 
 
 
 
Maturity less than 1 year
$
262

 
$
—

 
$
—

 
$
262

Maturity 1 to 5 years
107

 
—

 
—

 
107

Corporate debt securities
 

 
 

 
 

 
 

Maturity 1 to 5 years
70

 
—

 
—

 
70

Other debt securities
 

 
 

 
 

 
 

Maturity less than 1 year
47

 
—

 
—

 
47

Maturity 1 to 5 years
3

 
—

 
—

 
3

Equity securities
 
 
 

 
 

 
 

Available-for-sale
309

 
4

 
(1
)
 
312

 
$
798

 
$
4

 
$
(1
)
 
$
801


 
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 $1 million in unrealized losses at June 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 $5 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 June 30, 2015.