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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]  
Valuation and Qualifying Accounts
VALUATION AND QUALIFYING ACCOUNTS

For the three years ended December 31, 2018

(in millions) 
 
Balance
at beginning
of period 
 
Additions
charged to
expense(1)
 
Amounts
(credited)
charged to
other income
statement
accounts (2) 
 
Deductions
and other, net
of recoveries (3)(4) 
 
Balance
at end
of period 
Allowance for Losses:
 
 
 
 
 
 
 
 
 
 
2018
Accounts Receivable
 
$
2

 
$
—

 
$
—

 
$
(1
)
 
$
1

2017
Accounts Receivable
 
7

 
(1
)
 
—

 
(4
)
 
2

2016
Accounts Receivable
 
6

 
4

 
—

 
(3
)
 
7

 
 
 
 
 
 
 
 
 
 
 
 
Tax Valuation Allowance:
 
 
 
 
 
 
 
 
 
 
2018
Tax Valuation
 
35

 
9

 
—

 
—

 
44

2017
Tax Valuation
 
24

 
11

 
—

 
—

 
35

2016
Tax Valuation
 
38

 
—

 
—

 
(14
)
 
24

 __________
(1)
Account Receivables: additions charged to expense represent bad debt provisions relate to estimated losses due to credit and similar collectibility issues.
(2)
Account Receivables: Other charges (credits) relate to adjustments to reserves necessary to reflect events of non-payment such as customer accommodations and contract terminations.
(3)
Account Receivables: Deductions and other, net of recoveries primarily relates to receivable write-offs, but also includes the impact of foreign currency translation adjustments and recoveries of previously written off receivables.