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Marketable Securities And Cash Equivalents (Tables)
 6 Months Ended
Jun. 30, 2013
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities and Cash Equivalents
 
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
 
(In millions)
 
 
 
 
 
 
 
 
June 30, 2013
 
 
 
 
 
 
 
United States government obligations
 
 
 
 
 
 
 
Maturity less than 1 year
$
329

 
$
—

 
$
—

 
$
329

Maturity 1 to 5 years
161

 
—

 
—

 
161

Government–sponsored enterprise obligations
 

 
 

 
 

 
 

Maturity 1 to 5 years
2

 
—

 
—

 
2

Corporate debt securities
 

 
 

 
 

 
 

Maturity less than 1 year
1

 
—

 
—

 
1

Maturity 1 to 5 years
13

 
—

 
—

 
13

Other debt securities
 

 
 

 
 

 
 

Maturity less than 1 year
1,201

 
—

 
—

 
1,201

Maturity 1 to 5 years
3

 
—

 
—

 
3

Equity securities


 
 

 
 

 
 

Available-for-sale
540

 
11

 
(10
)
 
541

 
$
2,250

 
$
11

 
$
(10
)
 
$
2,251


 
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
 
(In millions)
 
 
 
 
 
 
 
 
December 31, 2012
 
 
 
 
 
 
 
United States government obligations
 
 
 
 
 
 
 
Maturity less than 1 year
$
583

 
$
—

 
$
—

 
$
583

Maturity 1 to 5 years
93

 
—

 
—

 
93

Government–sponsored enterprise obligations
 

 
 

 
 

 
 

Maturity 1 to 5 years
2

 
—

 
—

 
2

Corporate debt securities
 

 
 

 
 

 
 

Maturity 1 to 5 years
15

 
—

 
—

 
15

Other debt securities
 

 
 

 
 

 
 

Maturity less than 1 year
1,038

 
—

 
—

 
1,038

Maturity 1 to 5 years
3

 
—

 
—

 
3

Equity securities
 

 
 

 
 

 
 

Available-for-sale
606

 
3

 
(5
)
 
604

 
$
2,340

 
$
3

 
$
(5
)
 
$
2,338