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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2015
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, |  |  |  |  |  |  |  |  |
2015 (a) | $ | 34 |  |  | $ | 24 |  |  | $ | (3 | ) |  | $ | (21 | ) |  | $ | 34 |
2014 (a) | 50 |  |  | 17 |  |  | (3 | ) |  | (30 | ) |  | 34 |
2013 | 40 |  |  | 15 |  |  | 10 |  |  | (15 | ) |  | 50 |
Tax Valuation Allowance: |  |  |  |  |  |  |  |  |
Year Ended December 31, |  |  |  |  |  |  |  |  |
2015 (a)(b) | $ | 319 |  |  | $ | 20 |  |  | $ | 12 |  |  | $ | — |  |  | $ | 351 |
2014 (a) | 347 |  |  | (9 | ) |  | (13 | ) |  | (6 | ) |  | 319 |
2013 (c) | 298 |  |  | 27 |  |  | 22 |  |  | — |  |  | 347 |
__________
(a) | Other adjustments relate to currency translation adjustments.
(b) | Other adjustments relate to the acquisition of Brazil.
(c) | Other adjustments relate to the acquisition of Zipcar.

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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 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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