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Valuation and Qualifying Accounts
12 Months Ended
Dec. 31, 2018
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
 
Deductions
 
Balance at End of Period
Allowance for Doubtful Accounts:
 
 
 
 
 
 
 
 
 
 
Year Ended December 31,
 
 
 
 
 
 
 
 
 
 
2018 (a)
 
$
36

 
$
34

 
$
(2
)
 
$
(29
)
 
$
39

2017 (a)
 
38

 
29

 
3

 
(34
)
 
36

2016 (a)
 
34

 
27

 
(2
)
 
(21
)
 
38

 
 
 
 
 
 
 
 
 
 
 
Tax Valuation Allowance:
 
 
 
 
 
 
 
 
 
 
Year Ended December 31,
 
 
 
 
 
 
 
 
 
 
2018 (a)
 
$
331

 
$
(3
)
 
$
(17
)
 
$

 
$
311

2017 (a)
 
357

 

 
13

 
(39
)
 
331

2016 (a)
 
351

 
17

 
3

 
(14
)
 
357

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