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Asset Retirement Obligations (Tables)
12 Months Ended
Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Changes to the Company's Before-tax Asset Retirement Obligation
The following table indicates the changes to the company’s before-tax asset retirement obligations in 2021, 2020 and 2019:
202120202019
Balance at January 1$13,616 $12,832 $14,050 
Liabilities assumed in the Noble acquisition 630 — 
Liabilities incurred31 10 32 
Liabilities settled(1,887)(1,661)(1,694)
Accretion expense616 560 628 
Revisions in estimated cash flows432 1,245 (184)
Balance at December 31$12,808 $13,616 $12,832