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Summary of Significant Accounting Policies (Schedule of Revenue from Contracts with Customers) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	$ 3,759	$ 4,495
Oil, Gas and NGL Sales [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	2,679	3,175
Oil, Gas and NGL Sales [Member] | Oil [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	2,143	2,406
Oil, Gas and NGL Sales [Member] | Gas [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	213	307
Oil, Gas and NGL Sales [Member] | NGL [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	323	462
Marketing and Midstream Revenues [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	1,080	1,320
Marketing and Midstream Revenues [Member] | Oil [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	730	776
Marketing and Midstream Revenues [Member] | Gas [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	152	209
Marketing and Midstream Revenues [Member] | NGL [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	$ 198	$ 335

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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