Acquisitions and Dispositions - (Schedule Of Major Classes Of Assets And Liabilities Relating To The Disposal Groups Reported As Held For Sale) (Detail) - USD ($) $ in Millions		Dec. 31, 2024	Dec. 31, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets		$ 0	$ 18,577
Current liabilities		$ 0	8,885
East Ohio | Enbridge
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	[1]		497
Property, plant and equipment, net			5,443
Other deferred charges and other assets, including goodwill and intangible assets	[2]		2,659
Current liabilities	[3],[4]		560
Long-term debt	[5]		2,286
Other deferred credits and liabilities	[6]		1,437
PSNC | Enbridge
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	[1]		336
Property, plant and equipment, net			2,806
Other deferred charges and other assets, including goodwill and intangible assets	[2]		834
Current liabilities	[3],[4]		224
Long-term debt	[5]		948
Other deferred credits and liabilities	[6]		711
Questar Gas and Wexpro | Enbridge
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	[1]		764
Property, plant and equipment, net			4,369
Other deferred charges and other assets, including goodwill and intangible assets	[2]		814
Current liabilities	[3],[4]		389
Long-term debt	[5]		1,205
Other deferred credits and liabilities	[6]		1,116
Other Sales | Tredegar Solar Fund I, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	[1]		1
Property, plant and equipment, net			26
Current liabilities	[3],[4]		7
Other deferred credits and liabilities	[6]		$ 2

[1] Includes cash and cash equivalents of $4 million, $2 million and $26 million within the East Ohio, PSNC and Questar Gas Transactions, respectively. Also includes regulatory assets of $75 million, $89 million and $297 million within the East Ohio, PSNC and Questar Gas Transactions, respectively.

[2] Includes goodwill of $1.5 billion, $673 million and $768 million within the East Ohio, PSNC and Questar Gas Transactions, respectively. Also includes regulatory assets of $781 million, $86 million and $(39) million within the East Ohio, PSNC and Questar Gas Transactions, respectively.

[3] Includes regulatory liabilities of $54 million, $44 million and $55 million within the East Ohio, PSNC and Questar Gas Transactions, respectively.

[4] Questar Gas Transaction includes $40 million of 2.98% unsecured senior notes at December 31, 2023, which were scheduled to mature in December 2024.

[5] Includes East Ohio Unsecured Senior Notes due 2025 to 2052 at rates from 1.30% to 6.38% and with a weighted-average coupon rate for debt outstanding at December 31, 2023 of 3.13%; PSNC Unsecured Senior Notes due 2026 to 2053 at rates from 3.10% to 7.45% and with a weighted-average coupon rate for debt outstanding at December 31, 2023 of 4.67%; and Questar Gas Unsecured Senior Notes due 2024 to 2052 at rates from 2.21% to 7.20% and with a weighted-average coupon rate for debt outstanding at December 31, 2023 of 3.99%; in the East Ohio, PSNC and Questar Gas Transactions, respectively.

[6] Includes regulatory liabilities of $711 million, $435 million and $502 million within the East Ohio, PSNC and Questar Gas Transactions, respectively.