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Acquisitions and Dispositions (Acquisition of SCANA) (Narrative) (Detail) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jan. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Business Acquisition And Dispositions [Line Items] |  |  |  |
Stock issued during period for acquisition, value |  |  | $ 6,818 |
Regulatory Liabilities |  | $ 11,230 |  | $ 11,498
After tax charge in statements of income |  | (270) | (680) |
Impairment of assets and other charges |  | $ 768 | $ 835 |
SCANA |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |
Stock issued during period for acquisition, shares | 95.6 |  |  |
Stock issued during period for acquisition, value | $ 6,800 |  |  |
Common stock agreed to be issued, percentage | 0.669% |  |  |
Total outstanding debt | $ 6,900 |  |  |
Period to provide refund to customer |  |  | 11 years |
Regulatory Liabilities |  |  | $ 1,000 |
Reduction in operating revenue |  |  | (1,000) |
After tax charge in statements of income |  |  | (756) |
Impairment of assets and other charges |  |  | 178 |
Impairment of assets and other charges, after tax |  |  | 133 |
SCANA | NND Project |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |
Property, plant and equipment | 105 |  |  |
Impairment of assets and other charges |  |  | 105 |
Impairment of assets and other charges, after tax |  |  | 79 |
Income tax regulatory assets | $ 264 |  |  |
SCANA | NND Project | Income tax expense (benefit) |  |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |  |
Impairment of assets and other charges |  |  | $ 198 |

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