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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2016
Fair Value Disclosures [Abstract]  
Investments
Investments
(In millions)
Balance 
 
Level 1
 
Level 2
 
Level 3
March 31, 2016
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Equity securities
$
3

 
$
3

 
$
—

 
$
—

Government bonds
49

 
—

 
49

 
—

Total assets at fair value
$
52


$
3

 
$
49

 
$
—

 


 


 


 


December 31, 2015
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Equity securities
$
4

 
$
4

 
$
—

 
$
—

Government bonds
67

 
—

 
67

 
—

Total assets at fair value
$
71

 
$
4

 
$
67

 
$
—