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RESERVE ROLLFORWARDS | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
RESERVE ROLLFORWARDS | RESERVE ROLLFORWARDS Valuation and Qualifying Accounts
(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 |
(Dollars in millions) |  |  | Additions |  |  |  |
| Balance at January 1, 2015 |  | Charges (Credits) to Cost and Expense |  | Other Accounts |  | Deductions |  | Balance at December 31, 2015
Reserve for: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Doubtful accounts and returns | $ | 10 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 13 |
LIFO inventory | 462 |  |  | (166 | ) |  | — |  |  | — |  |  | 296 |
Non-environmental asset retirement obligations | 44 |  |  | 4 |  |  | — |  |  | 2 |  |  | 46 |
Environmental contingencies | 345 |  |  | 9 |  |  | 11 |  |  | 29 |  |  | 336 |
Deferred tax valuation allowance | 264 |  |  | 58 |  |  | (18 | ) |  | 50 |  |  | 254 |
| $ | 1,125 |  |  | $ | (94 | ) |  | $ | (5 | ) |  | $ | 81 |  |  | $ | 945 |

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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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