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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Supplemental Information On Oil And Gas Operations [Abstract] |  |  |
Standardized measure of discounted future net cash flows, beginning balance | $ 31,314 | $ 19,301 | $ 3,472
Net changes in prices and production costs | (16,797) | 14,081 | 8,274
Oil, gas and NGL sales, net of production costs | (7,863) | (11,285) | (7,400)
Changes in estimated future development costs | 218 | (216) | (414)
Extensions and discoveries, net of future development costs | 5,222 | 7,279 | 3,877
Purchase of reserves | 0 | 4,185 | 12,460
Sales of reserves in place | (9) | (20) | (12)
Revisions of quantity estimates | (747) | (874) | 838
Previously estimated development costs incurred during the period | 1,567 | 956 | 663
Accretion of discount | 2,972 | 2,059 | 1,218
Net change in income taxes and other | 3,436 | (4,152) | (3,675)
Standardized measure of discounted future net cash flows, ending balance | $ 19,313 | $ 31,314 | $ 19,301

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