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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS
 
Balance at
Credited/
Charges
Balance at
 
Beginning of
Charged to
Utilized/
End of
(in millions)
Period
Net Income
Write-Offs
Period
Allowances for Doubtful Accounts and Authorized Credits
 
 
 
 
Year ended December 31, 2018
$
—

2

(1
)
$
1

Year ended December 31, 2017
$
—

1

(1
)
$
—

Year ended December 31, 2016
$
1

1

(2
)
$
—

Tax Valuation Allowance
 
 
 
 
Year ended December 31, 2018
$
7

—

—

$
7

Year ended December 31, 2017
$
6

1

—

$
7

Year ended December 31, 2016
$
5

1

—

$
6