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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
The following table sets forth items in short-term and long-term investments. 
 
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

 
 
 
 
 
 
 
 
 
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