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, 2023	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets		$ 18,529	$ 1,785
Current liabilities		8,885	1,403
East Ohio | Enbridge
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	[1]	497	544
Property, plant and equipment, net		5,443	5,012
Other deferred charges and other assets, including goodwill and intangible assets	[2]	2,659	2,629
Current liabilities	[3],[4]	560	634
Long-term debt	[5]	2,286	2,287
Other deferred credits and liabilities	[6]	1,437	1,435
PSNC | Enbridge
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	[1]	336	381
Property, plant and equipment, net		2,806	2,591
Other deferred charges and other assets, including goodwill and intangible assets	[2]	834	822
Current liabilities	[3],[4]	224	151
Long-term debt	[5]	948	798
Other deferred credits and liabilities	[6]	711	689
Questar Gas and Wexpro | Enbridge
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	[1]	764	803
Property, plant and equipment, net		4,369	3,984
Other deferred charges and other assets, including goodwill and intangible assets	[2]	766	1,043
Current liabilities	[3],[4]	389	612
Long-term debt	[5]	1,205	1,245
Other deferred credits and liabilities	[6]	1,116	1,087
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	10
Property, plant and equipment, net		26	50
Other deferred charges and other assets, including goodwill and intangible assets	[2]		34
Current liabilities	[3],[4]	7	6
Other deferred credits and liabilities	[6]	$ 2	$ 11

[1] Includes cash and cash equivalents of $4 million and $6 million within the East Ohio Transaction, $2 million and less than $1 million within the PSNC Transaction and $26 million and $28 million within the Questar Gas Transaction at December 31, 2023 and 2022, respectively. Also includes regulatory assets of $75 million and $90 million within the East Ohio Transaction, $89 million and $95 million within the PSNC Transaction and $297 million and $273 million within the Questar Gas Transaction at December 31, 2023 and 2022, respectively.

[2] Includes goodwill of $1.5 billion and $673 million at both December 31, 2023 and 2022 within the East Ohio and PSNC Transactions, respectively, and $720 million and $983 million within the Questar Gas Transaction at December 31, 2023 and 2022, respectively. Also includes regulatory assets of $781 million and $751 million within the East Ohio Transaction, $86 million and $93 million within the PSNC Transaction and $(39) million and $(22) million within the Questar Gas Transaction at December 31, 2023 and 2022, respectively.

[3] Includes regulatory liabilities of $54 million and $43 million within the East Ohio Transaction, $44 million and $11 million within the PSNC Transaction and $55 million and $144 million within the Questar Gas Transaction at December 31, 2023 and 2022, respectively.

[4] Questar Gas Transaction includes $40 million of 2.98% unsecured senior notes at December 31, 2023, which are 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 and $749 million within the East Ohio Transaction, $435 million and $436 million within the PSNC Transaction and $502 million and $506 million within the Questar Gas Transaction at December 31, 2023 and 2022, respectively.