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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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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.

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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 FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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- References No definition available. + Details
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