Acquisitions and Dispositions - (Schedule Of Major Classes Of Assets And Liabilities Relating To The Disposal Groups Reported As Held For Sale) (Parenthetical) (Detail) - USD ($) $ in Millions	1 Months Ended
	Jul. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
East Ohio | Enbridge
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and Cash Equivalents			$ 4
Regulatory assets			75
Goodwill			1,500
Other deferred charges and other assets, including regulatory assets			781
Regulatory liabilities			54
Other deferred credits and liabilities including regulatory liabilities			711
PSNC | Senior Notes Due in 2034 | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest rate percentage	5.65%
Debt maturity year	2034
PSNC | Senior Notes Due in 2034 | Private Placement | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total Long-term Debt	$ 150
PSNC | Senior Notes Due in 2054 | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest rate percentage	6.04%
Debt maturity year	2054
PSNC | Senior Notes Due in 2054 | Private Placement | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total Long-term Debt	$ 150
PSNC | Enbridge
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Regulatory assets		$ 81	89
Goodwill		673	673
Other deferred charges and other assets, including regulatory assets		81	86
Regulatory liabilities		2	44
Other deferred credits and liabilities including regulatory liabilities		427	435
PSNC | Enbridge | Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and Cash Equivalents		$ 1	2
Questar Gas and Wexpro | Enbridge
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and Cash Equivalents			26
Regulatory assets			297
Goodwill			720
Other deferred charges and other assets, including regulatory assets			39
Regulatory liabilities			55
Other deferred credits and liabilities including regulatory liabilities			$ 502