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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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	$ 3,530	$ 5,796	$ 7,289	$ 10,291
Oil, Gas and NGL Sales [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	2,493	4,100	5,172	7,275
Oil, Gas and NGL Sales [Member] | Oil [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	2,106	2,970	4,249	5,376
Oil, Gas and NGL Sales [Member] | Gas [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	122	557	335	864
Oil, Gas and NGL Sales [Member] | NGL [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	265	573	588	1,035
Marketing and Midstream Revenues [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	1,037	1,696	2,117	3,016
Marketing and Midstream Revenues [Member] | Oil [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	735	952	1,465	1,728
Marketing and Midstream Revenues [Member] | Gas [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	123	322	275	531
Marketing and Midstream Revenues [Member] | NGL [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	$ 179	$ 422	$ 377	$ 757

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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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