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Summary of Significant Accounting Policies (Schedule of Revenue from Contracts with Customers Disaggregated Based on Type of Good) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	$ 13,750	$ 4,673	$ 6,674
Oil, Gas and NGL Sales [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	9,531	2,695	3,809
Oil, Gas and NGL Sales [Member] | Oil [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	6,996	2,034	2,988
Oil, Gas and NGL Sales [Member] | Gas [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	1,104	326	391
Oil, Gas and NGL Sales [Member] | NGL [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	1,431	335	430
Marketing and Midstream Revenues [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	4,219	1,978	2,865
Marketing and Midstream Revenues [Member] | Oil [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	2,451	936	1,534
Marketing and Midstream Revenues [Member] | Gas [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	718	488	645
Marketing and Midstream Revenues [Member] | NGL [Member]
Disaggregation Of Revenue [Line Items]
Oil, gas and NGL sales	$ 1,050	$ 554	$ 686

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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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