v3.25.4
Supplemental Information on Oil and Gas Producing Activities (Unaudited) - Changes in standardized measure of discounted future net cash flow (Details)
$ in Millions
12 Months Ended
Dec. 31, 2025
USD ($)
$ / Mcfe
Dec. 31, 2024
USD ($)
$ / Mcfe
Dec. 31, 2023
USD ($)
$ / Mcfe
Oil and gas reserves      
12-month weighted average price (in dollars per Mcfe | $ / Mcfe 3.75 2.96 3.2
Changes in Standardized Measure of Discounted Future Net Cash Flow      
Sales of oil and gas, net of productions costs $ (1,855) $ (1,086) $ (1,357)
Net changes in prices and production costs 6,053 (2,231) (25,672)
Development costs incurred during the period 511 512 637
Net changes in future development costs (207) (117) (96)
Extensions, discoveries and other additions 160 121 69
Acquisition of reserves 284    
Divestitures of reserves   (34)  
Revisions of previous quantity estimates 769 105 190
Accretion of discount 383 593 2,947
Net change in income taxes (1,233) 498 5,069
Changes in timing and other (250) 39 (256)
Net increase (decrease) 4,615 (1,600) (18,469)
Beginning of year 3,495 5,095 23,564
End of year 8,110 3,495 5,095
Future income tax expense included in Standardized Measure 4,000 1,000 2,200
VIE, Martica      
Changes in Standardized Measure of Discounted Future Net Cash Flow      
Beginning of year 101 170  
End of year $ 72 $ 101 $ 170