Acquisitions and Dispositions - (Schedule of Capital Expenditures and Significant Noncash Items Reported As Discontinued Operations) (Parenthetical) (Detail) $ in Millions	1 Months Ended
Nov. 30, 2021 USD ($)
Wexpro \| Natural Gas Gathering Systems \| Questar Gas and Wexpro
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to acquire existing natural gas gathering systems	$ 41

The cash outflow to purchase long lived physical asset use for the normal oil and gas operations and not intended for resale.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-13

Name:	us-gaap_PaymentsToAcquireOilAndGasEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration