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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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	$ 4,251	$ 3,797	$ 12,849	$ 11,432
Oil, Gas and NGL Sales [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	2,809	2,665	8,645	8,090
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	2,267	2,273	6,855	6,875
Oil, Gas and NGL Sales [Member] | Gas [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	186	49	673	234
Oil, Gas and NGL Sales [Member] | NGL [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	356	343	1,117	981
Marketing and Midstream Revenues [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	1,442	1,132	4,204	3,342
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	932	815	2,709	2,423
Marketing and Midstream Revenues [Member] | Gas [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	252	105	769	326
Marketing and Midstream Revenues [Member] | NGL [Member]
Disaggregation Of Revenue [Line Items]
Total revenues from contracts with customers	$ 258	$ 212	$ 726	$ 593

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