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Asset Retirement Obligations and Accrued Environmental Costs (Tables) | 12 Months Ended
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Dec. 31, 2022
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations and Accrued Environmental Costs | Asset retirement obligations and accrued environmental costs at December 31 were:
| Millions of Dollars
| 2022 | 2021
Asset retirement obligations | $ | 6,380 |  | 5,926 |
Accrued environmental costs | 182 |  | 187 |
Total asset retirement obligations and accrued environmental costs | 6,562 |  | 6,113 |
Asset retirement obligations and accrued environmental costs due within one year* | (161) |  | (359) |
Long-term asset retirement obligations and accrued environmental costs | $ | 6,401 |  | 5,754 |
Changes in Asset Retirement Obligation | During 2022 and 2021, our overall ARO changed as follows:
| Millions of Dollars
| 2022 | 2021
Balance at January 1 | $ | 5,926 |  | 5,573 |
Accretion of discount | 245 |  | 238 |
New obligations | 144 |  | 555 |
Changes in estimates of existing obligations | 681 |  | (113) |
Spending on existing obligations | (231) |  | (164) |
Property dispositions | (203) |  | (108) |
Foreign currency translation | (182) |  | (55) |
Balance at December 31 | $ | 6,380 |  | 5,926 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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