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Summary of Significant Accounting Policies (Schedule of Revenue from Contracts with Customers) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Disaggregation Of Revenue [Line Items] |  |  |  |
Oil, gas and NGL sales | $ 4,030 | $ 5,184 | $ 11,319 | $ 15,475
Oil, Gas and NGL Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Oil, gas and NGL sales | 2,882 | 3,668 | 8,054 | 10,943
Oil, Gas and NGL Sales [Member] | Oil [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Oil, gas and NGL sales | 2,377 | 2,515 | 6,626 | 7,891
Oil, Gas and NGL Sales [Member] | Gas [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Oil, gas and NGL sales | 189 | 666 | 524 | 1,530
Oil, Gas and NGL Sales [Member] | NGL [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Oil, gas and NGL sales | 316 | 487 | 904 | 1,522
Marketing and Midstream Revenues [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Oil, gas and NGL sales | 1,148 | 1,516 | 3,265 | 4,532
Marketing and Midstream Revenues [Member] | Oil [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Oil, gas and NGL sales | 795 | 787 | 2,260 | 2,515
Marketing and Midstream Revenues [Member] | Gas [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Oil, gas and NGL sales | 153 | 387 | 428 | 918
Marketing and Midstream Revenues [Member] | NGL [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Oil, gas and NGL sales | $ 200 | $ 342 | $ 577 | $ 1,099

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