Summary of Significant Accounting Policies (Schedule of Revenue from Contracts with Customers) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	$ 4,508	$ 4,550
Oil, Gas and NGL Sales [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	2,977	3,126
Oil, Gas and NGL Sales [Member] \| Crude Oil, Condensate, and Natural Gas Liquids (NGL) [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	2,423	2,414
Oil, Gas and NGL Sales [Member] \| Gas [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	205	309
Oil, Gas and NGL Sales [Member] \| NGL [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	349	403
Marketing and Midstream Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	1,531	1,424
Marketing and Midstream Revenues [Member] \| Crude Oil, Condensate, and Natural Gas Liquids (NGL) [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	1,001	918
Marketing and Midstream Revenues [Member] \| Gas [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	254	272
Marketing and Midstream Revenues [Member] \| NGL [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	$ 276	$ 234

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details