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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
Schedule II – Valuation and Qualifying Accounts
(in millions)
Description
 
Balance at Beginning of Period
 
Expensed
 
Other Adjustments
 
Deductions
 
Balance at End of Period
Allowance for Doubtful Accounts:
 
 
 
 
 
 
 
 
 
 
Year Ended December 31,
 
 
 
 
 
 
 
 
 
 
2017 (a)
 
$
38

 
$
29

 
$
3

 
$
(34
)
 
$
36

2016 (a)
 
34

 
27

 
(2
)
 
(21
)
 
38

2015 (a)
 
34

 
24

 
(3
)
 
(21
)
 
34

 
 
 
 
 
 
 
 
 
 
 
Tax Valuation Allowance:
 
 
 
 
 
 
 
 
 
 
Year Ended December 31,
 
 
 
 
 
 
 
 
 
 
2017 (a)
 
$
357

 
$
—

 
$
13

 
$
(39
)
 
$
331

2016 (a)
 
351

 
17

 
3

 
(14
)
 
357

2015 (a)(b)
 
319

 
20

 
12

 
—

 
351

__________
(a) 
Other adjustments relate to currency translation adjustments.
(b) 
Other adjustments relate to the acquisition of Brazil.