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Marketable Securities
 3 Months Ended
Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Marketable Securities

 
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
 
(In millions)
 
 
 
 
 
 
 
 
March 31, 2017
 
 
 
 
 
 
 
United States government obligations
 
 
 
 
 
 
 
Maturity less than 1 year
$
258

 
$
—

 
$
—

 
$
258

Maturity 1 to 5 years
115

 
—

 
(1
)
 
114

Corporate debt securities
 

 
 

 
 

 
 

Maturity less than 1 year
2

 
—

 
—

 
2

Maturity 1 to 5 years
82

 
—

 
—

 
82

Other debt securities
 

 
 

 
 

 
 

Maturity less than 1 year
12

 
—

 
—

 
12

 
$
469

 
$
—

 
$
(1
)
 
$
468


 
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
 
(In millions)
 
 
 
 
 
 
 
 
December 31, 2016
 
 
 
 
 
 
 
United States government obligations
 
 
 
 
 
 
 
Maturity less than 1 year
$
287

 
$
—

 
$
—

 
$
287

Maturity 1 to 5 years
121

 
—

 
(1
)
 
120

Corporate debt securities
 

 
 

 
 

 
 

Maturity less than 1 year
1

 
—

 
—

 
1

Maturity 1 to 5 years
66

 
—

 
—

 
66

Other debt securities
 

 
 

 
 

 
 

Maturity less than 1 year
8

 
—

 
—

 
8

Equity securities
 

 
 

 
 

 
 

Available-for-sale
1

 
—

 
—

 
1

 
$
484

 
$
—

 
$
(1
)
 
$
483



The $1 million in unrealized losses at March 31, 2017 arose within the last 12 months and is related to the Company’s investment in one available-for-sale debt security with a fair value of $39 million.  The contractual terms of this investment do not permit the issuer to settle the securities at a price less than the amortized cost basis of the investment. Because the Company does not intend to sell the investment and it is not more likely than not that it will be required to sell the investment before recovery of its amortized cost basis, which may be maturity, the Company does not consider this investment to be other-than-temporarily impaired at March 31, 2017.