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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Aug. 16, 2022
Mar. 31, 2021
Jan. 07, 2021
Income Tax [Line Items]            
Corporate alternative minimum tax       15.00%    
Deferred income taxes           $ 249
Federal valuation allowance amount removed $ 814 $ 893        
Income tax expense (benefit) 1,738 65 $ (547)      
Current income tax expense (benefit) 559 16 (219)      
Deferred income tax expense (benefit) 1,179 49 $ (328)      
Valuation allowance against deferred tax assets, percent     100.00%      
Unrecognized tax benefits increased 51          
Net operating loss carryforwards, deferred tax assets 526 1,075        
Net operating loss carryforwards 22          
Unrecognized tax benefits, interest expense (benefit) 0          
Unrecognized tax benefit that would impact effective tax rate 73 36        
Unrecognized tax benefits, decrease resulting from current period tax positions 42 5        
Deferred unrecognized tax benefits   42        
Severance and other non-income tax refunds 5 39 $ 40      
CARES Act [Member]            
Income Tax [Line Items]            
Income tax expense (benefit)     (113)      
Current income tax expense (benefit)     (220)      
Deferred income tax expense (benefit)     $ 107      
United States Federal [Member]            
Income Tax [Line Items]            
Federal valuation allowance amount removed 268          
Net operating loss carryforwards 221          
United States Federal [Member] | Expires between 2030 and 2037 [Member]            
Income Tax [Line Items]            
Net operating loss carryforwards 199          
Various U.S. States [Member]            
Income Tax [Line Items]            
Net operating loss carryforwards 305          
WPX Merger [Member]            
Income Tax [Line Items]            
Deferred income taxes $ 1       $ 250  
WPX Merger [Member] | United States Federal [Member]            
Income Tax [Line Items]            
Federal valuation allowance amount removed   $ 84