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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
Schedule II – Valuation and Qualifying Accounts
(in millions)
 
Additions/(deductions)
Balance at
beginning of
year
 
Net charges
to income
 
Deductions and other 1
 
Balance at end
of year
Year ended December 31, 2017
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
28

 
$
15

 
$
(11
)
 
$
33

 
 
 
 
 
 
 
 
Year ended December 31, 2016
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
37

 
$
8

 
$
(17
)
 
$
28

 
 
 
 
 
 
 
 
Year ended December 31, 2015
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
38

 
$
12

 
$
(13
)
 
$
37

1 
Primarily includes uncollectible accounts written off, net of recoveries, impact of acquisitions and divestitures and adjustments for foreign currency translation.