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Schedule II - Qualifying And Valuation Accounts | 12 Months Ended
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Dec. 31, 2017
Valuation And Qualifying Accounts [Abstract] |
Schedule II - Qualifying And Valuation Accounts | SCHEDULE II – Qualifying and Valuation accounts for each of the three years in the period ended December 31, 2017
|  |  |  |  |  | Additions |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts (in millions) |  | Balance at beginning of period |  |  | Charged to costs and expenses |  |  | Charged (credited) to other accounts (1)(2) |  |  | Deductions from reserves |  |  | Balance at end of period |
Year ended December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 127 |  |  |  | 4 |  |  |  | 8 |  |  |  | (19 | ) |  | $ | 120 |
Deferred tax asset valuation allowance |  | $ | 150 |  |  |  | 350 |  |  |  | — |  |  |  | (17 | ) |  | $ | 483 |
Year ended December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 110 |  |  |  | 16 |  |  |  | 11 |  |  |  | (10 | ) |  | $ | 127 |
Deferred tax asset valuation allowance |  | $ | 135 |  |  |  | 16 |  |  |  | 3 |  |  |  | (4 | ) |  | $ | 150 |
Year ended December 31, 2015: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 119 |  |  |  | 30 |  |  |  | (10 | ) |  |  | (29 | ) |  | $ | 110 |
Deferred tax asset valuation allowance |  | $ | 129 |  |  |  | 30 |  |  |  | (16 | ) |  |  | (8 | ) |  | $ | 135 |
(1) | Valuation accounts of acquired or divested companies and foreign currency translation adjustments.
(2) | Amounts include adjustments related to the divestiture of the BioSciences business.
Reserves are deducted from assets to which they apply.

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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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