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Supplemental Information on Oil and Gas Operations (Unaudited) (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
MMBoe
$ / bbl
$ / Mcf
Dec. 31, 2022
USD ($)
MMBoe
Dec. 31, 2021
USD ($)
MMBoe
Dec. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Reserve Quantities [Line Items]            
Proved developed and undeveloped reserves, revisions due to prices (78) 34 155      
Proved developed and undeveloped reserves, revisions other than price (MMBoe) (1) (49) 43      
Proved developed reserve net energy period increase decrease 11          
Proved developed and undeveloped reserves, additional downward revisions other than price(MMBoe) (12)   10      
Proved developed and undeveloped reserves, extensions and discoveries 322 278 228      
Proved developed and undeveloped reserves revisions due to change in previously adopted development plans (8)          
Proved developed and undeveloped reserves, Purchase of reserves   153 663      
Proved undeveloped reserves increased percentage 1.00%          
Proved undeveloped reserves as percentage of entire proved reserves 22.00%          
Proved undeveloped reserves due to drilling and development activities (MMBoe) 177          
Conversion to proved developed reserves 165          
Cost incurred related to development and conversion of proved undeveloped reserves | $ $ 1,500          
Proved Undeveloped Reserves Revisions with Additional Revisions (4)          
Average estimated future realized price per barrel of oil used to estimate future cash inflows for proved oil reserves | $ / bbl 76.29          
Average estimated future realized price per Mcf of gas used to estimate future cash inflows for proved gas reserves | $ / Mcf 1.74          
Average estimated future realized price per barrel of natural gas liquids used to estimate future cash inflows for proved NGL reserves | $ / bbl 20.43          
Future development costs | $ $ 5,241 $ 5,176 $ 3,689      
Future dismantlement, abandonment and rehabilitation costs | $ $ 900          
Scenario Forecast [Member]            
Reserve Quantities [Line Items]            
Future development costs | $       $ 800 $ 1,000 $ 1,800
Maximum [Member]            
Reserve Quantities [Line Items]            
Proved developed and undeveloped reserves, revisions other than price (MMBoe)     53      
Delaware Basin            
Reserve Quantities [Line Items]            
Proved developed and undeveloped reserves, revisions other than price (MMBoe) 7 33 23      
Proved developed and undeveloped reserves, extensions and discoveries 212 255 209      
Proved developed and undeveloped reserves, Purchase of reserves     538      
Proved undeveloped reserves percentage 78.00%          
Percentage of extensions and discoveries proved undeveloped reserves 59.00%          
Proved undeveloped reserves revisions other than price (2)          
Proved Undeveloped Reserves Revisions with Additional Revisions (2)          
Williston Basin            
Reserve Quantities [Line Items]            
Proved developed and undeveloped reserves, revisions other than price (MMBoe) (19)   12      
Proved developed and undeveloped reserves, extensions and discoveries 19 5 6      
Proved developed and undeveloped reserves, Purchase of reserves   66 125      
Percentage of extensions and discoveries proved undeveloped reserves 4.00%          
Proved undeveloped reserves revisions other than price (5)          
Proved Undeveloped Reserves Revisions with Additional Revisions (1)          
STACK [Member]            
Reserve Quantities [Line Items]            
Proved developed and undeveloped reserves, revisions other than price (MMBoe) 4   12      
Proved developed and undeveloped reserves, extensions and discoveries   5 8      
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 32 6 3      
Proved developed and undeveloped reserves, Purchase of reserves   87        
Percentage of extensions and discoveries proved undeveloped reserves 12.00%          
Proved Undeveloped Reserves Revisions with Additional Revisions (1)          
Powder River Basin [Member]            
Reserve Quantities [Line Items]            
Proved developed and undeveloped reserves, revisions other than price (MMBoe) 2 5        
Proved developed and undeveloped reserves, extensions and discoveries 26 7 2      
Percentage of extensions and discoveries proved undeveloped reserves 11.00%          
Proved undeveloped reserves revisions other than price (1)          
Anadarko Basin            
Reserve Quantities [Line Items]            
Proved developed and undeveloped reserves, revisions other than price (MMBoe)   4        
Proved developed and undeveloped reserves, extensions and discoveries 33          
Percentage of extensions and discoveries proved undeveloped reserves 14.00%