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RESERVE ROLLFORWARDS | 12 Months Ended
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Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
RESERVE ROLLFORWARDS | RESERVE ROLLFORWARDS Valuation and Qualifying Accounts
(Dollars in millions) |  |  | Additions |  |  |  |
| Balance at January 1, 2018 |  | Charges (Credits) to Cost and Expense |  | Other Accounts |  | Deductions |  | Balance at December 31, 2018
Reserve for: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Doubtful accounts and returns | $ | 12 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | 11 |
LIFO inventory | 288 |  |  | 44 |  |  | 5 |  |  | — |  |  | 337 |
Non-environmental asset retirement obligations | 49 |  |  | (2 | ) |  | — |  |  | 1 |  |  | 46 |
Environmental contingencies | 304 |  |  | 9 |  |  | — |  |  | 17 |  |  | 296 |
Deferred tax valuation allowance | 410 |  |  | 60 |  |  | (4 | ) |  | — |  |  | 466 |
| $ | 1,063 |  |  | $ | 111 |  |  | $ | 1 |  |  | $ | 19 |  |  | $ | 1,156 |
(Dollars in millions) |  |  | Additions |  |  |  |
| Balance at January 1, 2017 |  | Charges (Credits) to Cost and Expense |  | Other Accounts |  | Deductions |  | Balance at December 31, 2017
Reserve for: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Doubtful accounts and returns | $ | 10 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 12 |
LIFO inventory | 264 |  |  | 24 |  |  | — |  |  | — |  |  | 288 |
Non-environmental asset retirement obligations | 46 |  |  | 2 |  |  | 1 |  |  | — |  |  | 49 |
Environmental contingencies | 321 |  |  | 8 |  |  | 4 |  |  | 29 |  |  | 304 |
Deferred tax valuation allowance | 278 |  |  | 126 |  |  | 6 |  |  | — |  |  | 410 |
| $ | 919 |  |  | $ | 163 |  |  | $ | 11 |  |  | $ | 30 |  |  | $ | 1,063 |
(Dollars in millions) |  |  | Additions |  |  |  |
| Balance at January 1, 2016 |  | Charges (Credits) to Cost and Expense |  | Other Accounts |  | Deductions |  | Balance at December 31, 2016
Reserve for: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Doubtful accounts and returns | $ | 13 |  |  | $ | (2 | ) |  | $ | — |  |  | $ | 1 |  |  | $ | 10 |
LIFO inventory | 296 |  |  | (32 | ) |  | — |  |  | — |  |  | 264 |
Non-environmental asset retirement obligations | 46 |  |  | — |  |  | — |  |  | — |  |  | 46 |
Environmental contingencies | 336 |  |  | 10 |  |  | 1 |  |  | 26 |  |  | 321 |
Deferred tax valuation allowance | 254 |  |  | 20 |  |  | 4 |  |  | — |  |  | 278 |
| $ | 945 |  |  | $ | (4 | ) |  | $ | 5 |  |  | $ | 27 |  |  | $ | 919 |

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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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