Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Assets:
Deferred compensation plan assets	$ 74	$ 72
Investment in affiliate	144	123
Assets, fair value disclosure	223	203
Liabilities:
Liabilities, fair value disclosure	1,327	300
Total recurring fair value measurements	(1,104)	(97)
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Deferred compensation plan assets	74	72
Investment in affiliate	144	123
Assets, fair value disclosure	218	195
Liabilities:
Liabilities, fair value disclosure	0	0
Total recurring fair value measurements	218	195
Significant Other Observable Inputs (Level 2)
Assets:
Deferred compensation plan assets	0	0
Investment in affiliate	0	0
Assets, fair value disclosure	5	8
Liabilities:
Liabilities, fair value disclosure	1,239	209
Total recurring fair value measurements	(1,234)	(201)
Significant Unobservable Inputs (Level 3)
Assets:
Deferred compensation plan assets	0	0
Investment in affiliate	0	0
Assets, fair value disclosure	0	0
Liabilities:
Liabilities, fair value disclosure	88	91
Total recurring fair value measurements	(88)	(91)
Commodity price derivatives
Assets:
Commodity price derivatives	5	8
Liabilities:
Commodity price derivatives	1,239	209
Commodity price derivatives \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Commodity price derivatives	0	0
Liabilities:
Commodity price derivatives	0	0
Commodity price derivatives \| Significant Other Observable Inputs (Level 2)
Assets:
Commodity price derivatives	5	8
Liabilities:
Commodity price derivatives	1,239	209
Commodity price derivatives \| Significant Unobservable Inputs (Level 3)
Assets:
Commodity price derivatives	0	0
Liabilities:
Commodity price derivatives	0	0
Marketing derivatives
Liabilities:
Commodity price derivatives	88	91
Marketing derivatives \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities:
Commodity price derivatives	0	0
Marketing derivatives \| Significant Other Observable Inputs (Level 2)
Liabilities:
Commodity price derivatives	0	0
Marketing derivatives \| Significant Unobservable Inputs (Level 3)
Liabilities:
Commodity price derivatives	$ 88	$ 91

Recurring Measurements, (Fair Value, Net).

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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.

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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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Fair value, after offset of derivative liability, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value portion of investments in an entity not consolidated. Includes, but is not limited to, investments in an entity that is affiliated with the reporting entity by means of direct or indirect ownership, an entity in which the reporting entity shares control of the entity with another party or group, an entity which the company has significant influence, but does not have control and subsidiaries that are not required to be consolidated and are accounted for using the equity or cost method.

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Fair value of financial and nonfinancial obligations.

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