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Asset Retirement Obligations and Accrued Environmental Costs (Tables)
 12 Months Ended
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
20222021
Asset retirement obligations$6,380 5,926 
Accrued environmental costs182 187 
Total asset retirement obligations and accrued environmental costs6,562 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
20222021
Balance at January 1$5,926 5,573 
Accretion of discount245 238 
New obligations144 555 
Changes in estimates of existing obligations681 (113)
Spending on existing obligations(231)(164)
Property dispositions(203)(108)
Foreign currency translation(182)(55)
Balance at December 31
$6,380 5,926