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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Tables)
 12 Months Ended
Dec. 31, 2019
SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS [Abstract]  
Summary of Valuation Allowance
 
 
 
 
Additions
 
 
 
 
Description
 
Balance
Beginning
of Year
 
Charged to
Costs and
Expense
 
Charged to
Other
Accounts
 
Deductions
 
Balance at
End of
Period
 
 
(In millions)
Reserves for doubtful accounts:
 
 
 
 
 
 
 
 
 
 
Year ended December 31, 2019
 
$
8

 
$
2

 
$
—

 
$
1

 
$
9

Year ended December 31, 2018
 
$
14

 
$
2

 
$
—

 
$
8

 
$
8

Year ended December 31, 2017
 
$
9

 
$
9

 
$
—

 
$
4

 
$
14

 
 
 
 
 
 
 
 
 
 
 
Deferred tax valuation allowance:
 
 
 
 
 
 
 
 
 
 
Year ended December 31, 2019
 
$
73

 
$
4

 
$
1

 
$
(13
)
 
$
65

Year ended December 31, 2018
 
$
77

 
$
6

 
$
(4
)
 
$
(6
)
 
$
73

Year ended December 31, 2017
 
$
71

 
$
16

 
$
(2
)
 
$
(8
)
 
$
77