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Valuation and Qualifying Accounts | 12 Months Ended
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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.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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