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v3.20.4

RESERVE ROLLFORWARDS (Tables) | 12 Months Ended
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Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule of Valuation and Qualifying Accounts | Valuation and Qualifying Accounts
(Dollars in millions) |  |  | Additions |  |  |  |
| Balance at January 1, 2020 |  | Charges (Credits) to Cost and Expense |  | Other Accounts |  | Deductions |  | Balance at December 31, 2020
Reserve for: |  |  |  |  |  |  |  |  |
Credit losses | $ | 11 |  |  | $ | 4 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 14 |
LIFO inventory | 248 |  |  | (22) |  |  | — |  |  | — |  |  | 226 |
Non-environmental asset retirement obligations | 48 |  |  | 2 |  |  | 1 |  |  | — |  |  | 51 |
Environmental contingencies | 287 |  |  | 8 |  |  | — |  |  | 10 |  |  | 285 |
Deferred tax valuation allowance | 453 |  |  | (61) |  |  | 1 |  |  | — |  |  | 393 |
| $ | 1,047 |  |  | $ | (69) |  |  | $ | 2 |  |  | $ | 11 |  |  | $ | 969 |
(Dollars in millions) |  |  | Additions |  |  |  |
| Balance at January 1, 2019 |  | Charges (Credits) to Cost and Expense |  | Other Accounts |  | Deductions |  | Balance at December 31, 2019
Reserve for: |  |  |  |  |  |  |  |  |
Credit losses | $ | 11 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 11 |
LIFO inventory | 337 |  |  | (89) |  |  | — |  |  | — |  |  | 248 |
Non-environmental asset retirement obligations | 46 |  |  | 2 |  |  | — |  |  | — |  |  | 48 |
Environmental contingencies | 296 |  |  | 7 |  |  | — |  |  | 16 |  |  | 287 |
Deferred tax valuation allowance | 487 |  |  | (20) |  |  | (14) |  |  | — |  |  | 453 |
| $ | 1,177 |  |  | $ | (100) |  |  | $ | (14) |  |  | $ | 16 |  |  | $ | 1,047 |
(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: |  |  |  |  |  |  |  |  |
Credit losses | $ | 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 |  |  | 81 |  |  | (4) |  |  | — |  |  | 487 |
| $ | 1,063 |  |  | $ | 132 |  |  | $ | 1 |  |  | $ | 19 |  |  | $ | 1,177 |

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- Definition A Tabular disclosure of allowance and reserve accounts including 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 No definition available. + Details
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