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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2016
Schedule II - Valuation and Qualifying Accounts |
Schedule II - Valuation and Qualifying Accounts |
Schedule II – Valuation and Qualifying Accounts in millions |  |
|  |  |  | Additions |  |  |  |  |
|  | Balance at Beginning of Period |  | Charged to Costs and Expenses |  | Charged to Other Accounts |  | Deductions (a) |  | Balance at End of Period |
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)
2014 |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 17 |  | $ | 4 |  | $ | (2 | ) | $ | — |  | $ | 19 | (b)
Environmental, litigation, tax and other reserves |  | $ | 496 |  | $ | 80 |  | $ | 183 |  | $ | (87 | ) | $ | 672 | (c)
Note: The amounts presented represent continuing operations. (a)Primarily represents payments. (b)Of these amounts, $17 million, $20 million and $19 million in 2016, 2015 and 2014, respectively, are classified as current. (c)Of these amounts, $197 million, $98 million and $287 million in 2016, 2015 and 2014, 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 -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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