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Summary of Significant Accounting Policies (Schedule of Revenue from Contracts with Customers) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | $ 3,894 | $ 3,530 | $ 7,635 | $ 7,289
Oil, Gas and NGL Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 2,796 | 2,493 | 5,425 | 5,172
Oil, Gas and NGL Sales [Member] | Oil [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 2,413 | 2,106 | 4,602 | 4,249
Oil, Gas and NGL Sales [Member] | Gas [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 57 | 122 | 185 | 335
Oil, Gas and NGL Sales [Member] | NGL [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 326 | 265 | 638 | 588
Marketing and Midstream Revenues [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 1,098 | 1,037 | 2,210 | 2,117
Marketing and Midstream Revenues [Member] | Oil [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 801 | 735 | 1,608 | 1,465
Marketing and Midstream Revenues [Member] | Gas [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | 100 | 123 | 221 | 275
Marketing and Midstream Revenues [Member] | NGL [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenues from contracts with customers | $ 197 | $ 179 | $ 381 | $ 377

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