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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
Valuation and Qualifying Accounts | Schedule II – Valuation and Qualifying Accounts (in millions)
Description |  | Balance at Beginning of Period |  | Expensed |  | Other Adjustments |  | Deductions |  | Balance at End of Period
Allowance for Doubtful Accounts: |  |  |  |  |  |  |  |  |  |
Year Ended December 31, |  |  |  |  |  |  |  |  |  |
2017 (a) |  | $ | 38 |  |  | $ | 29 |  |  | $ | 3 |  |  | $ | (34 | ) |  | $ | 36 |
2016 (a) |  | 34 |  |  | 27 |  |  | (2 | ) |  | (21 | ) |  | 38 |
2015 (a) |  | 34 |  |  | 24 |  |  | (3 | ) |  | (21 | ) |  | 34 |
Tax Valuation Allowance: |  |  |  |  |  |  |  |  |  |
Year Ended December 31, |  |  |  |  |  |  |  |  |  |
2017 (a) |  | $ | 357 |  |  | $ | — |  |  | $ | 13 |  |  | $ | (39 | ) |  | $ | 331 |
2016 (a) |  | 351 |  |  | 17 |  |  | 3 |  |  | (14 | ) |  | 357 |
2015 (a)(b) |  | 319 |  |  | 20 |  |  | 12 |  |  | — |  |  | 351 |
__________
(a) | Other adjustments relate to currency translation adjustments.
(b) | Other adjustments relate to the acquisition of Brazil.

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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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