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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
Schedule II – Valuation and Qualifying Accounts
(in millions)
Description
 
Balance at Beginning of Period
 
Expense (Benefit)
 
Other Adjustments(a)
 
Deductions
 
Balance at End of Period
Allowance for Doubtful Accounts:
 
 
 
 
 
 
 
 
 
 
Year Ended December 31,
 
 
 
 
 
 
 
 
 
 
2019
 
$
39

 
$
41

 
$
—

 
$
(28
)
 
$
52

2018
 
36

 
34

 
(2
)
 
(29
)
 
39

2017
 
38

 
29

 
3

 
(34
)
 
36

 
 
 
 
 
 
 
 
 
 
 
Tax Valuation Allowance:
 
 
 
 
 
 
 
 
 
 
Year Ended December 31,
 
 
 
 
 
 
 
 
 
 
2019
 
$
311

 
$
(95
)
 
$
(2
)
 
$
—

 
$
214

2018
 
331

 
(3
)
 
(17
)
 
—

 
311

2017
 
357

 
—

 
13

 
(39
)
 
331

__________
(a) 
Other adjustments relate to currency translation adjustments.