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Acquisitions and Dispositions - (Schedule of Major Classes of Assets and Liabilities of Disposal Groups Reported As Held for Sale) (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Current assets |  | $ 1,776 | $ 1,182 |
Property, plant and equipment, net |  | 28 | 21 | $ 18
Current liabilities |  | 1,398 | 954 |
Business Review Dispositions | East Ohio Transaction |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Current assets | [1] | 544 | 439 |
Property, plant and equipment, net |  | 5,012 | 4,636 |
Other deferred charges and other assets, including goodwill and intangible assets | [2] | 2,629 | 2,563 |
Current liabilities | [3] | 634 | 557 |
Long-term debt | [4] | 2,287 | 1,786 |
Other deferred credits and liabilities | [5] | 1,435 | 1,408 |
Business Review Dispositions | PSNC Transaction |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Current assets | [1] | 381 | 296 |
Property, plant and equipment, net |  | 2,591 | 2,506 |
Other deferred charges and other assets, including goodwill and intangible assets | [2] | 822 | 823 |
Current liabilities | [3] | 151 | 133 |
Long-term debt | [4] | 798 | 798 |
Other deferred credits and liabilities | [5] | 689 | 673 |
Business Review Dispositions | Questar Gas Transaction |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Current assets | [1] | 803 | 422 |
Property, plant and equipment, net |  | 3,984 | 3,677 |
Other deferred charges and other assets, including goodwill and intangible assets | [2] | 1,043 | 1,101 |
Current liabilities | [3] | 612 | 263 |
Long-term debt | [4] | 1,245 | 995 |
Other deferred credits and liabilities | [5] | 1,087 | 1,039 |
Business Review Dispositions | Other |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |
Current assets | [1] | 1 | 1 |
Property, plant and equipment, net |  | 47 | 52 |
Current liabilities | [3] | 1 | 1 |
Other deferred credits and liabilities | [5] | $ 9 | $ 14 |
[1] | Includes cash and cash equivalents of $6 million and $3 million within the East Ohio Transaction, less than $1 million and $14 million within the PSNC Transaction and $28 million and $17 million within the Questar Gas Transaction at December 31, 2022 and 2021, respectively. Also includes regulatory assets of $90 million and $56 million within the East Ohio Transaction, $95 million and $88 million within the PSNC Transaction and $273 million and $125 million within the Questar Gas Transaction at December 31, 2022 and 2021, respectively
[2] | Includes goodwill of $1.5 billion, $673 million and $983 million at both December 31, 2022 and 2021 within the East Ohio, PSNC and Questar Gas Transactions, respectively. Also includes regulatory assets of $751 million and $607 million within the East Ohio Transaction, $93 million and $103 million within the PSNC Transaction and $(22) million and $47 million within the Questar Gas Transaction at December 31, 2022 and 2021, respectively.
[3] | Includes regulatory liabilities of $43 million and $51 million within the East Ohio Transaction, $11 million and $18 million within the PSNC Transaction and $144 million and $28 million within the Questar Gas Transaction at December 31, 2022 and 2021, respectively.
[4] | 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, 2022 of 3.13%; PSNC Unsecured Senior Notes due 2026 to 2051 at rates from 3.10% to 7.45% and with a weighted-average coupon rate for debt outstanding at December 31, 2022 of 4.34% 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, 2022 of 3.99%.
[5] | Includes regulatory liabilities of $749 million and $754 million within the East Ohio Transaction, $436 million and $435 million within the PSNC Transaction and $506 million and $500 million within the Questar Gas Transaction at December 31, 2022 and 2021, respectively.

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