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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Supplemental Information On Oil And Gas Operations [Abstract]      
Standardized measure of discounted future net cash flows, beginning balance $ 19,301 $ 3,472 $ 5,398
Net changes in prices and production costs 14,081 8,274 (3,277)
Oil, gas and NGL sales, net of production costs (11,285) (7,400) (1,572)
Changes in estimated future development costs (216) (414) 402
Extensions and discoveries, net of future development costs 7,279 3,877 988
Purchase of reserves 4,185 12,460 23
Sales of reserves in place (20) (12) (7)
Revisions of quantity estimates (874) 838 147
Previously estimated development costs incurred during the period 956 663 537
Accretion of discount 2,059 1,218 285
Net change in income taxes and other (4,152) (3,675) 548
Standardized measure of discounted future net cash flows, ending balance $ 31,314 $ 19,301 $ 3,472