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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2016
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,
 
 
 
 
 
 
 
 
 
2016 (a)
$
34

 
$
27

 
$
(2
)
 
$
(21
)
 
$
38

2015 (a)
34

 
24

 
(3
)
 
(21
)
 
34

2014 (a)
50

 
17

 
(3
)
 
(30
)
 
34

 
 
 
 
 
 
 
 
 
 
Tax Valuation Allowance:
 
 
 
 
 
 
 
 
 
Year Ended December 31,
 
 
 
 
 
 
 
 
 
2016 (a)
$
351

 
$
17

 
$
3

 
$
(14
)
 
$
357

2015 (a)(b)
319

 
20

 
12

 
—

 
351

2014 (a)
347

 
(9
)
 
(13
)
 
(6
)
 
319

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