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Restructuring Costs
 3 Months Ended
Mar. 31, 2024
Restructuring and Related Activities [Abstract]  
Restructuring Costs Restructuring Costs
Restructuring costs are primarily related to workforce reductions and associated severance benefits that were triggered by the merger with Cimarex Energy Co. that closed on October 1, 2021. The following table summarizes the Company’s restructuring liabilities:
Three Months Ended 
March 31,
(In millions)20242023
Balance at beginning of period$47 $77 
Additions related to merger integration— 7
Reductions related to severance payments(11)(7)
Balance at end of period$36 $77