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Fair Value Measurement - Range and Arithmetic Average of Significant Unobservable Inputs (Details) - Lower 48 Gulf Coast and Rockies noncore field - Level 3 Inputs - Fair Value, Nonrecurring - Lower 48 $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021 $ / MMBTU	Dec. 31, 2021 USD ($) MMcf
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value | $		$ 472
Measurement Input, Commodity Future Price | Valuation Technique, Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Future prices annual increase (decrease), percentage		2.00%
Measurement Input, Natural Gas | Valuation Technique, Discounted Cash Flow | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Commodity production (MBOED) | MMcf		0.2
Oil and gas, price outlook | $ / MMBTU	41.45
Measurement Input, Natural Gas | Valuation Technique, Discounted Cash Flow | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Commodity production (MBOED) | MMcf		17
Oil and gas, price outlook | $ / MMBTU	93.68
Measurement Input, Natural Gas | Valuation Technique, Discounted Cash Flow | Arithmetic Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Commodity production (MBOED) | MMcf		5.4
Oil and gas, price outlook | $ / MMBTU	64.39
Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rate	7.30%
Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rate	9.70%
Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow | Arithmetic Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Discount rate	8.70%

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The future price annual increase (decrease) after year 2034, determined the Henry Hub natural gas price outlook based on external pricing service companies' outlooks for years 2022-2034.

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Sales price per unit of oil and gas produced.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Discount rate used to estimate the fair value of servicing assets and servicing liabilities.

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