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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value Disclosures [Abstract]  
Investments Measured at Fair Value on a Recurring Basis
Investments Measured at Fair Value on a Recurring Basis
(In millions)
Balance
 
Level 1
 
Level 2
 
Level 3
December 31, 2015
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Equity securities
$
4

 
$
4

 
$
—

 
$
—

Government bonds
67

 
—

 
67

 
—

Total assets at fair value
$
71

 
$
4

 
$
67

 
$
—

 
 
 
 
 
 
 
 
December 31, 2014
 
 
 
 
 
 
 
Assets:
 
 
 
 
 
 
 
Equity securities
$
15

 
$
15

 
$
—

 
$
—

Government bonds
70

 
—

 
70

 
—

Total assets at fair value
$
85

 
$
15

 
$
70

 
$
—