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Acquisitions - Pro Forma (Details) - Cimarex
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
Business Acquisition [Line Items]  
Pro forma revenue | $ $ 3,011
Pro forma net income | $ $ 219
Pro forma basic earnings per share (in dollars per share) | $ / shares $ 0.27
Pro forma diluted earnings per share (in dollars per share) | $ / shares $ 0.27