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Summary of Significant Accounting Policies (Schedule of Revenue from Contracts with Customers Disaggregated Based on Type of Good) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation Of Revenue [Line Items] |  |  |
Oil, gas and NGL sales | $ 15,140 | $ 19,827 | $ 13,750
Oil, Gas and NGL Sales [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Oil, gas and NGL sales | 10,791 | 14,082 | 9,531
Oil, Gas and NGL Sales [Member] | Gas [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Oil, gas and NGL sales | 703 | 1,948 | 1,104
Oil, Gas and NGL Sales [Member] | NGL [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Oil, gas and NGL sales | 1,209 | 1,853 | 1,431
Oil, Gas and NGL Sales [Member] | Oil [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Oil, gas and NGL sales | 8,879 | 10,281 | 6,996
Marketing and Midstream Revenues [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Oil, gas and NGL sales | 4,349 | 5,745 | 4,219
Marketing and Midstream Revenues [Member] | Gas [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Oil, gas and NGL sales | 572 | 1,163 | 718
Marketing and Midstream Revenues [Member] | NGL [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Oil, gas and NGL sales | 759 | 1,277 | 1,050
Marketing and Midstream Revenues [Member] | Oil [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Oil, gas and NGL sales | $ 3,018 | $ 3,305 | $ 2,451

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