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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
 
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

 
 
 
 
 
 
 
 
 
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