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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2020
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 | 2020 |  | 2019 |  | 2018
Employee Termination Benefits |  |  |  |  |
Balance at January 1 | $ | 7 |  |  | $ | 19 |  |  | $ | 62 |
Additions (reductions) charged to expense | 859 |  |  | 6 |  |  | 5 |
Payments | (396) |  |  | (18) |  |  | (48) |
Balance at December 31 | $ | 470 |  |  | $ | 7 |  |  | $ | 19 |
Expected Credit Losses |  |  |  |  |
Beginning allowance balance for expected credit losses | $ | 849 |  |  | $ | 980 |  |  | $ | 606 |
Current period provision | 573 |  |  | (128) |  |  | 379 |
Write-offs charged against the allowance, if any | (751) |  |  | (3) |  |  | (5) |
Recoveries of amounts previously written-off, if any | — |  |  | — |  |  | — |
Balance at December 31 | $ | 671 |  |  | $ | 849 |  |  | $ | 980 |
Deferred Income Tax Valuation Allowance 1 |  |  |  |  |
Balance at January 1 | $ | 15,965 |  |  | $ | 15,973 |  |  | $ | 16,574 |
Additions to deferred income tax expense 2 | 2,892 |  |  | 1,336 |  |  | 2,000 |
Reduction of deferred income tax expense | (1,095) |  |  | (1,344) |  |  | (2,601) |
Balance at December 31 | $ | 17,762 |  |  | $ | 15,965 |  |  | $ | 15,973 |
1 See also Note 15 to the Consolidated Financial Statements, beginning on page 79. 2 Includes $974 of additions associated with the purchase of Noble.

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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=120395691&loc=d3e24092-122690 + Details
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