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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation and Qualifying Accounts | Schedule II — Valuation and Qualifying Accounts
| Year ended December 31 |
Millions of Dollars | 2017 |  | 2016 |  | 2015 |
Employee Termination Benefits |  |  |
Balance at January 1 | $ | 111 |  | $ | 308 |  | $ | 49 |
Additions (reductions) charged to expense | 20 |  | 160 |  | 342 |
Payments | (69 | ) | (357 | ) | (83 | )
Balance at December 31 | $ | 62 |  | $ | 111 |  | $ | 308 |
Allowance for Doubtful Accounts |  |  |
Balance at January 1 | $ | 487 |  | $ | 429 |  | $ | 194 |
Additions to expense | 128 |  | 76 |  | 251 |
Bad debt write-offs | (9 | ) | (18 | ) | (16 | )
Balance at December 31 | $ | 606 |  | $ | 487 |  | $ | 429 |
Deferred Income Tax Valuation Allowance* |  |  |
Balance at January 1 | $ | 16,069 |  | $ | 15,412 |  | $ | 16,292 |
Additions to deferred income tax expense | 2,681 |  | 1,810 |  | 1,440 |
Reduction of deferred income tax expense | (2,176 | ) | (1,153 | ) | (2,320 | )
Balance at December 31 | $ | 16,574 |  | $ | 16,069 |  | $ | 15,412 |
* See also Note 1 8 to the Consolidated Financial Statements, beginning on page 75.

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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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