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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation and Qualifying Accounts | Schedule II — Valuation and Qualifying Accounts
| Year ended December 31 |
Millions of Dollars | 2018 |  | 2017 |  | 2016 |
Employee Termination Benefits |  |  |
Balance at January 1 | $ | 62 |  | $ | 111 |  | $ | 308 |
Additions (reductions) charged to expense | 5 |  | 20 |  | 160 |
Payments | (48 | ) | (69 | ) | (357 | )
Balance at December 31 | $ | 19 |  | $ | 62 |  | $ | 111 |
Allowance for Doubtful Accounts |  |  |
Balance at January 1 | $ | 606 |  | $ | 487 |  | $ | 429 |
Additions to expense | 379 |  | 128 |  | 76 |
Bad debt write-offs | (5 | ) | (9 | ) | (18 | )
Balance at December 31 | $ | 980 |  | $ | 606 |  | $ | 487 |
Deferred Income Tax Valuation Allowance* |  |  |
Balance at January 1 | $ | 16,574 |  | $ | 16,069 |  | $ | 15,412 |
Additions to deferred income tax expense | 2,000 |  | 2,681 |  | 1,810 |
Reduction of deferred income tax expense | (2,601 | ) | (2,176 | ) | (1,153 | )
Balance at December 31 | $ | 15,973 |  | $ | 16,574 |  | $ | 16,069 |
* See also Note 16 to the Consolidated Financial Statements, beginning on page 74.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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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