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Supplemental Information on Oil and Gas Operations (Unaudited) (Schedule Of Principal Changes In The Standardized Measure Of Discounted Future Net Cash Flows Attributable To Proved Reserves) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Supplemental Information On Oil And Gas Operations [Abstract]      
Standardized measure of discounted future net cash flows, beginning balance $ 19,313 $ 31,314 $ 19,301
Net changes in prices and production costs (3,202) (16,797) 14,081
Oil, gas and NGL sales, net of production costs (7,993) (7,863) (11,285)
Changes in estimated future development costs 806 218 (216)
Extensions and discoveries, net of future development costs 3,951 5,222 7,279
Purchase of reserves 3,123 0 4,185
Sales of reserves in place 0 (9) (20)
Revisions of quantity estimates 427 (747) (874)
Previously estimated development costs incurred during the period 1,269 1,567 956
Accretion of discount 1,730 2,972 2,059
Net change in income taxes and other 346 3,436 (4,152)
Standardized measure of discounted future net cash flows, ending balance $ 19,770 $ 19,313 $ 31,314