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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Oct. 01, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
State tax effected net operating losses          
Deferred tax liabilities, net $ 3,101   $ 774    
Unrealized gain (loss) on investments 130        
Gain investments 2,800        
Net operating loss carryforwards 69        
Other credit carryforwards 10   0    
Unrecognized tax benefits 7   $ 6 $ 1 $ 17
Liability for accrued interest 1        
Cimarex          
State tax effected net operating losses          
Deferred income taxes 2,200 $ 2,201      
State          
State tax effected net operating losses          
Net operating loss carryforwards 3,000        
Valuation allowance on operating loss carryforwards 136        
Federal          
State tax effected net operating losses          
Net operating loss carryforwards 1,100        
NOL not subject to expiration 224        
Federal | Cimarex          
State tax effected net operating losses          
Net operating loss carryforwards   $ 1,300      
Federal | Tax Years 2034 Through 2037          
State tax effected net operating losses          
Net operating loss carryforwards 875        
Capital loss carryforward          
State tax effected net operating losses          
Other credit carryforwards 135        
Tax credit carryforwards valuation allowance 29        
Capital loss carryforward | Tax Year 2022          
State tax effected net operating losses          
Other credit carryforwards 64        
Capital loss carryforward | Tax Year 2025          
State tax effected net operating losses          
Other credit carryforwards 71        
Research and development tax credits          
State tax effected net operating losses          
Unrecognized tax benefits 1        
Marginal Well Credits          
State tax effected net operating losses          
Other credit carryforwards 10        
Tax credit carryforwards valuation allowance $ 4