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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
Schedule II - Valuation and Qualifying Accounts |
Schedule II - Valuation and Qualifying Accounts |
Schedule II – Valuation and Qualifying Accounts |  | Occidental Petroleum Corporation and Subsidiaries
in millions |
|  |  |  | Additions |  |  |  |  |
|  | Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Charged to Other Accounts |  | Deductions (a) |  | Balance at End of Period |
2017 |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 558 |  | $ | 37 |  | $ | (2) |  | $ | 1 |  | $ | 594 | (b)
Environmental, litigation, tax and other reserves |  | $ | 997 |  | $ | 49 |  | $ | 53 |  | $ | (127) |  | $ | 972 | (c)
2016 |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 20 |  | $ | 543 |  | $ | (3) |  | $ | (2) |  | $ | 558 | (b)
Environmental, litigation, tax and other reserves |  | $ | 479 |  | $ | 61 |  | $ | 531 |  | $ | (74) |  | $ | 997 | (c)
2015 |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 19 |  | $ | 9 |  | $ | (3) |  | $ | (5) |  | $ | 20 | (b)
Environmental, litigation, tax and other reserves |  | $ | 672 |  | $ | 119 |  | $ | 2 |  | $ | (314) |  | $ | 479 | (c)
Note: The amounts presented represent continuing operations.
| (a) |  | Primarily represents payments.v
| (b) |  | Of these amounts, $18 million, $17 million and $20 million in 2017, 2016 and 2015, respectively, are classified as current.
| (c) |  | Of these amounts, $163 million, $197 million and $98 million in 2017, 2016 and 2015, respectively, are classified as current.

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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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