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Supplemental Information on Oil and Gas Operations (Unaudited) (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
MMBoe
$ / bbl
$ / Mcf
Dec. 31, 2023
USD ($)
MMBoe
Dec. 31, 2022
USD ($)
MMBoe
Dec. 31, 2027
USD ($)
Dec. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Reserve Quantities [Line Items]            
Proved developed and undeveloped reserves, revisions due to prices 54 78 (34)      
Proved developed and undeveloped reserves, revisions other than price (MMBoe) 75 (1) (49)      
Proved developed reserve net energy period increase decrease 81 11        
Proved developed and undeveloped reserves, additional downward revisions other than price(MMBoe) (6) (12)        
Proved developed and undeveloped reserves, extensions and discoveries 340 322 278      
Proved developed and undeveloped reserves revisions due to change in previously adopted development plans (8)          
Proved developed and undeveloped reserves, Purchase of reserves 247   153      
Proved undeveloped reserves increased percentage 12.00%          
Proved undeveloped reserves as percentage of entire proved reserves 20.00%          
Proved undeveloped reserves due to drilling and development activities (MMBoe) 198          
Conversion to proved developed reserves 189          
Cost incurred related to development and conversion of proved undeveloped reserves | $ $ 1,200          
Proved Undeveloped Reserves Revisions with Additional Revisions (2)          
Average estimated future realized price per barrel of oil used to estimate future cash inflows for proved oil reserves | $ / bbl 73.65          
Average estimated future realized price per Mcf of gas used to estimate future cash inflows for proved gas reserves | $ / Mcf 0.81          
Average estimated future realized price per barrel of natural gas liquids used to estimate future cash inflows for proved NGL reserves | $ / bbl 20.75          
Future development costs | $ $ 6,099 $ 5,241 $ 5,176      
Future dismantlement, abandonment and rehabilitation costs | $ $ 1,300          
Scenario Forecast [Member]            
Reserve Quantities [Line Items]            
Future development costs | $       $ 500 $ 1,400 $ 2,200
Delaware Basin            
Reserve Quantities [Line Items]            
Proved developed and undeveloped reserves, revisions other than price (MMBoe) 55 7 (33)      
Proved developed and undeveloped reserves, extensions and discoveries 252 212 255      
Proved undeveloped reserves percentage 68.00%          
Percentage of extensions and discoveries proved undeveloped reserves 75.00%          
Proved undeveloped reserves revisions other than price (6)          
Williston Basin            
Reserve Quantities [Line Items]            
Proved developed and undeveloped reserves, additional downward revisions other than price(MMBoe)   (19)        
Proved developed and undeveloped reserves, extensions and discoveries 36 19 5      
Proved developed and undeveloped reserves, Purchase of reserves 247   66      
Percentage of extensions and discoveries proved undeveloped reserves 17.00%          
Proved undeveloped reserves revisions other than price (2)          
Eagle Ford [Member]            
Reserve Quantities [Line Items]            
Proved developed and undeveloped reserves, revisions other than price (MMBoe)   5        
Proved developed and undeveloped reserves, extensions and discoveries 16 32 6      
Proved developed and undeveloped reserves, Purchase of reserves     87      
Percentage of extensions and discoveries proved undeveloped reserves 2.00%          
Powder River Basin [Member]            
Reserve Quantities [Line Items]            
Proved developed and undeveloped reserves, revisions other than price (MMBoe) 6 2 (5)      
Proved developed and undeveloped reserves, extensions and discoveries 6 26 7      
Percentage of extensions and discoveries proved undeveloped reserves 3.00%          
Anadarko Basin            
Reserve Quantities [Line Items]            
Proved developed and undeveloped reserves, revisions other than price (MMBoe) 7 4 (4)      
Proved developed and undeveloped reserves, extensions and discoveries 30 33 5      
Proved undeveloped reserves percentage 17.00%          
Percentage of extensions and discoveries proved undeveloped reserves 3.00%