Acquisitions and Dispositions - (Schedule Of Major Classes Of Assets And Liabilities Relating To The Disposal Groups Reported As Held For Sale) (Parenthetical) (Detail) - Enbridge - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
East Ohio
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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Regulatory assets	$ 68	89
Goodwill	673	673
Other deferred charges and other assets, including regulatory assets	83	86
Regulatory liabilities	42	44
Other deferred credits and liabilities including regulatory liabilities	430	435
PSNC | 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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and Cash Equivalents	39	26
Regulatory assets	53	297
Goodwill	642	720
Other deferred charges and other assets, including regulatory assets	44	39
Regulatory liabilities	56	55
Other deferred credits and liabilities including regulatory liabilities	$ 498	$ 502