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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2023
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 | 2023 |  | 2022 |  | 2021
Employee Termination Benefits |  |  |  |  |
Balance at January 1 | $ | 11 |  |  | $ | 43 |  |  | $ | 470 |
Additions (reductions) charged to expense | (2) |  |  | 1 |  |  | (30) |
Payments | (3) |  |  | (33) |  |  | (397) |
Balance at December 31 | $ | 6 |  |  | $ | 11 |  |  | $ | 43 |
Expected Credit Losses |  |  |  |  |
Beginning allowance balance for expected credit losses | $ | 1,008 |  |  | $ | 745 |  |  | $ | 671 |
Current period provision | (367) |  |  | 263 |  |  | 74 |
Write-offs charged against the allowance, if any | — |  |  | — |  |  | — |
Balance at December 31 | $ | 641 |  |  | $ | 1,008 |  |  | $ | 745 |
Deferred Income Tax Valuation Allowance* |  |  |  |  |
Balance at January 1 | $ | 19,532 |  |  | $ | 17,651 |  |  | $ | 17,762 |
Additions to deferred income tax expense | 2,348 |  |  | 3,533 |  |  | 3,691 |
Reduction of deferred income tax expense | (1,464) |  |  | (1,652) |  |  | (3,802) |
Balance at December 31 | $ | 20,416 |  |  | $ | 19,532 |  |  | $ | 17,651 |
* See also Note 17 Taxes.

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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 -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-4 + Details
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