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Marketable Securities (Tables)
3 Months Ended
Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities [Table Text Block]
 
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
 
(In millions)
 
 
 
 
 
 
 
 
March 31, 2015
 
 
 
 
 
 
 
United States government obligations
 
 
 
 
 
 
 
Maturity less than 1 year
$
311

 
$

 
$

 
$
311

Maturity 1 to 5 years
95

 

 

 
95

Corporate debt securities
 

 
 

 
 

 
 

Maturity 1 to 5 years
73

 
1

 

 
74

Other debt securities
 

 
 

 
 

 
 

Maturity less than 1 year
95

 

 

 
95

Maturity 1 to 5 years
3

 

 

 
3

Equity securities
 
 
 

 
 

 
 

Available-for-sale
307

 
32

 
(4
)
 
335

 
$
884

 
$
33

 
$
(4
)
 
$
913


 
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