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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Supplemental Information On Oil And Gas Operations [Abstract]      
Standardized measure of discounted future net cash flows, beginning balance $ 3,472 $ 5,398 $ 7,150
Net changes in prices and production costs 8,274 (3,277) (2,323)
Oil, gas and NGL sales, net of production costs (7,400) (1,572) (2,612)
Changes in estimated future development costs (414) 402 303
Extensions and discoveries, net of future development costs 3,877 988 1,690
Purchase of reserves 12,460 23 43
Sales of reserves in place (12) (7) (481)
Revisions of quantity estimates 838 147 (359)
Previously estimated development costs incurred during the period 663 537 857
Accretion of discount 1,218 285 506
Net change in income taxes and other (3,675) 548 624
Standardized measure of discounted future net cash flows, ending balance $ 19,301 $ 3,472 $ 5,398