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Derivative and Hedging Activities - Derivative Instruments (Details) - Energy related derivative $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) MMBbls Bcf	Dec. 31, 2020 USD ($) MMBbls Bcf
Derivative [Line Items]
Derivative assets (liabilities), at fair value, net	$ (1,610)	$ (118)
Oil
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | MMBbls	27,000,000	34,000,000
Derivative assets (liabilities), at fair value, net	$ (467)	$ (137)
Oil | Fixed-price swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | MMBbls	18,000,000	27,000,000
Derivative assets (liabilities), at fair value, net	$ (464)	$ (136)
Oil | Basis protection swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | MMBbls	9,000,000	7,000,000
Derivative assets (liabilities), at fair value, net	$ (3)	$ (1)
Natural Gas
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | Bcf	762,000,000	847,000,000
Derivative assets (liabilities), at fair value, net	$ (1,143)	$ 19
Natural Gas | Fixed-price swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | Bcf	429,000,000	728,000,000
Derivative assets (liabilities), at fair value, net	$ (926)	$ 10
Natural Gas | Collars
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | Bcf	207,000,000	53,000,000
Derivative assets (liabilities), at fair value, net	$ (171)	$ 8
Natural Gas | Basis protection swaps
Derivative [Line Items]
Derivative, nonmonetary notional amount, volume | Bcf	126,000,000	66,000,000
Derivative assets (liabilities), at fair value, net	$ (46)	$ 1

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- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

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