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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Income Tax [Line Items]        
Federal valuation allowance amount removed $ 826 $ 814    
Valuation allowance against deferred tax assets, percent 50.00%      
Net operating loss carryforwards, deferred tax assets $ 447 526    
Net operating loss carryforwards 22      
Capital loss carryforwards 542 523    
Unrecognized tax benefits, interest expense (benefit) 4      
Unrecognized tax benefit that would impact effective tax rate 83 73    
Deferred unrecognized tax benefits     $ 42  
Current unrecognized tax benefits   $ 42    
United States Federal [Member]        
Income Tax [Line Items]        
Federal valuation allowance amount removed 264      
Net operating loss carryforwards 139      
United States Federal [Member] | Expires between 2030 and 2037 [Member]        
Income Tax [Line Items]        
Net operating loss carryforwards 117      
Various U.S. States [Member]        
Income Tax [Line Items]        
Net operating loss carryforwards 303      
Canada [Member]        
Income Tax [Line Items]        
Net operating loss carryforwards 5      
Capital loss carryforwards $ 557      
WPX Merger [Member]        
Income Tax [Line Items]        
Deferred income taxes       $ 250
WPX Merger [Member] | United States Federal [Member]        
Income Tax [Line Items]        
Federal valuation allowance amount removed     $ 84