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Supplemental Information
 12 Months Ended
Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]  
Supplemental Information
Supplemental Information
 
The table below provides changes in the allowance for doubtful accounts over each period.
(in millions)
2013
 
2012
 
2011
Balance at beginning of year
$
25

 
$
29

 
$
25

Additions charged to expense
8

 
4

 
11

Deductions/other
(11
)
 
(8
)
 
(7
)
Balance at end of year
$
22

 
$
25

 
$
29


The table below provides changes in the inventory valuation over each period.
(in millions)
2013
 
2012
 
2011
Balance at beginning of year
$
38

 
$
39

 
$
33

Additions charged to cost of revenue
14

 
9

 
17

Deductions/other
(11
)
 
(10
)
 
(11
)
Balance at end of year
$
41

 
$
38

 
$
39