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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
Valuation and Qualifying Accounts
(In millions)
 
Description
Balance at
Beginning
of Period
 
Charged to
Costs and
Expenses
 
Deductions 
 
Balance at
End of
Period
Valuation account for accounts receivable:
 
 
 
 
 
 
 
Year ended December 31, 2017
$
3

 
$
1

 
$
1

 
$
3

Year ended December 31, 2016
6

 
—

 
3

 
3

Year ended December 31, 2015
1

 
5

 
—

 
6

Valuation account for deferred tax assets:
 
 
 
 
 
 
 
Year ended December 31, 2017
$
47

 
$
91

 
$
4

 
$
134

Year ended December 31, 2016
48

 
18

 
19

 
47

Year ended December 31, 2015
57

 
5

 
14

 
48


See accompanying report of independent registered public accounting firm.