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Marketable Securities
 6 Months Ended
Jun. 30, 2016
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Marketable Securities

 
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
 
(In millions)
 
 
 
 
 
 
 
 
June 30, 2016
 
 
 
 
 
 
 
United States government obligations
 
 
 
 
 
 
 
Maturity less than 1 year
$
356

 
$
—

 
$
—

 
$
356

Maturity 1 to 5 years
115

 
1

 
—

 
116

Corporate debt securities
 

 
 

 
 

 
 

Maturity less than 1 year
1

 
—

 
—

 
1

Maturity 1 to 5 years
69

 
2

 
—

 
71

Other debt securities
 

 
 

 
 

 
 

Maturity less than 1 year
39

 
—

 
—

 
39

Equity securities
 
 
 

 
 

 
 

Available-for-sale
300

 
4

 
(4
)
 
300

 
$
880

 
$
7

 
$
(4
)
 
$
883


 
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



Of the $4 million in unrealized losses at June 30, 2016, $1 million 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 $4 million.  The market value of the investment that has been in an unrealized loss position for 12 months or longer is $4 million and is related to one available-for-sale equity security. 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, 2016.