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Valuation and Qualifying Accounts
12 Months Ended
Dec. 31, 2012
Valuation and Qualifying Accounts [Abstract]  
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, 2012
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
29

 
$
32

 
$
(7
)
 
$
54

 
 
 
 
 
 
 
 
Year ended December 31, 2011
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
38

 
$
26

 
$
(35
)
 
$
29

 
 
 
 
 
 
 
 
Year ended December 31, 2010
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
38

 
$
13

 
$
(13
)
 
$
38

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