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Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Valuation and Qualifying Accounts | Schedule II – Valuation and Qualifying Accounts (in millions)
Description |  | Balance at Beginning of Period |  | Expense (Benefit) |  | Other Adjustments |  | Deductions |  | Balance at End of Period
Allowance for Doubtful Accounts: |  |  |  |  |  |  |  |  |  |
Year Ended December 31, |  |  |  |  |  |  |  |  |  |
2018 (a) |  | $ | 36 |  |  | $ | 34 |  |  | $ | (2 | ) |  | $ | (29 | ) |  | $ | 39 |
2017 (a) |  | 38 |  |  | 29 |  |  | 3 |  |  | (34 | ) |  | 36 |
2016 (a) |  | 34 |  |  | 27 |  |  | (2 | ) |  | (21 | ) |  | 38 |
Tax Valuation Allowance: |  |  |  |  |  |  |  |  |  |
Year Ended December 31, |  |  |  |  |  |  |  |  |  |
2018 (a) |  | $ | 331 |  |  | $ | (3 | ) |  | $ | (17 | ) |  | $ | — |  |  | $ | 311 |
2017 (a) |  | 357 |  |  | — |  |  | 13 |  |  | (39 | ) |  | 331 |
2016 (a) |  | 351 |  |  | 17 |  |  | 3 |  |  | (14 | ) |  | 357 |
__________
(a) | Other adjustments relate to currency translation adjustments.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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