Inventories - Schedule of Inventories (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Components Of Inventory [Line Items]
Total inventories	$ 45	$ 77
Natural Gas [Member]
Components Of Inventory [Line Items]
Total inventories	27	43
Natural Gas Liquids
Components Of Inventory [Line Items]
Total inventories	$ 18	$ 34

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(6))
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 45
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
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