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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
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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

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