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Acquisitions and Dispositions - (Schedule of Major Classes of Assets and Liabilities of Disposal Groups Reported As Held for Sale) (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Regulatory assets | $ 10,148 | $ 9,109
Weighted-average coupon rate of outstanding debt | 4.73% | 0.31%
Business Review Dispositions | East Ohio Transaction |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Cash and cash equivalents | $ 6 | $ 3
Goodwill | 1,500 | 1,500
Regulatory assets (Current assets) | 90 | 56
Regulatory assets (Other deferred charges and other assets, including goodwill and intangible assets) | 751 | 607
Regulatory liabilities (Current liabilities) | 43 | 51
Regulatory liabilities (Other deferred credits and liabilities) | $ 749 | 754
Business Review Dispositions | East Ohio Transaction | Unsecured Senior Notes due 2025 to 2052 |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Weighted-average coupon rate of outstanding debt | 3.13% |
Business Review Dispositions | East Ohio Transaction | Maximum | Unsecured Senior Notes due 2025 to 2052 |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Interest Rate | 6.38% |
Business Review Dispositions | East Ohio Transaction | Minimum | Unsecured Senior Notes due 2025 to 2052 |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Interest Rate | 1.30% |
Business Review Dispositions | PSNC Transaction |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Cash and cash equivalents |  | 14
Goodwill | $ 673 | 673
Regulatory assets (Current assets) | 95 | 88
Regulatory assets (Other deferred charges and other assets, including goodwill and intangible assets) | 93 | 103
Regulatory liabilities (Current liabilities) | 11 | 18
Regulatory liabilities (Other deferred credits and liabilities) | $ 436 | 435
Business Review Dispositions | PSNC Transaction | Unsecured Senior Notes due 2026 to 2051 |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Weighted-average coupon rate of outstanding debt | 4.34% |
Business Review Dispositions | PSNC Transaction | Maximum |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Cash and cash equivalents | $ 1 |
Business Review Dispositions | PSNC Transaction | Maximum | Unsecured Senior Notes due 2026 to 2051 |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Interest Rate | 7.45% |
Business Review Dispositions | PSNC Transaction | Minimum | Unsecured Senior Notes due 2026 to 2051 |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Interest Rate | 3.10% |
Business Review Dispositions | Questar Gas Transaction |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Cash and cash equivalents | $ 28 | 17
Goodwill | 983 | 983
Regulatory assets (Current assets) | 273 | 125
Regulatory assets (Other deferred charges and other assets, including goodwill and intangible assets) | (22) | 47
Regulatory liabilities (Current liabilities) | 144 | 28
Regulatory liabilities (Other deferred credits and liabilities) | $ 506 | $ 500
Business Review Dispositions | Questar Gas Transaction | Unsecured Senior Notes due 2024 to 2052 |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Weighted-average coupon rate of outstanding debt | 3.99% |
Business Review Dispositions | Questar Gas Transaction | Maximum | Unsecured Senior Notes due 2024 to 2052 |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Interest Rate | 7.20% |
Business Review Dispositions | Questar Gas Transaction | Minimum | Unsecured Senior Notes due 2024 to 2052 |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |
Interest Rate | 2.21% |

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