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Schedule II – Valuation and Qualifying Accounts 


Additions
Balance at
Beginning
of Period
Charged to
Costs and
Expenses
Charged to
Other
Accounts
Deductions (a)
Balance at
End of
Period

Allowance for doubtful accounts
 

Environmental
 
 


Litigation, tax and other reserves







 
2011
Allowance for doubtful accounts
$19
$
$
$(3)
$16
Environmental
$366
$53
$14
$(73)
$360
Litigation, tax and other reserves
193
37
(32)
198
$559
$ 90
$14
$(105)
$558 (b)
2010
Allowance for doubtful accounts
$30
$(9)
$
$(2)
$19
Environmental
$403
$ 26
$3
$(66)
$366
Litigation, tax and other reserves
226
20
6
(59)
193
$ 629
$ 46
$ 9
$(125)
$559 (b)
 The amounts presented represent continuing operations.
(a) Primarily represents payments.
(b) Of these amounts, $98 million, $100 million and $102 million in 2012, 2011 and 2010, respectively, are classified as current.
