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Summary Of Significant Accounting Policies (Schedule Of Additional Investment Information) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Summary Of Significant Accounting Policies [Line Items] |  |  |
Oil, gas and NGL sales | $ 15,140 | $ 19,827 | $ 13,750
Accounts receivable | 1,573 | 1,767 |
Catalyst [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Oil, gas and NGL sales | 213 | 405 | 264
Production expenses | 93 | 55 | 42
Accounts receivable | $ 11 | $ 14 | $ 22

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