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Operating Segments (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |
Other comprehensive income (loss), net of tax | $ (31) | $ 132
SCANA |  |
Segment Reporting Information [Line Items] |  |
Income tax related to regulatory assets acquired | 264 |
Income tax related to regulatory assets acquired, after tax | 198 |
Virginia Electric and Power Company |  |
Segment Reporting Information [Line Items] |  |
Other comprehensive income (loss), net of tax | (5) | 5
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
After- tax net expenses | 1,400 | 218
Operating Segments | Virginia Electric and Power Company |  |
Segment Reporting Information [Line Items] |  |
After- tax net expenses | 324 | 189
Operating revenue recorded charge | 29 |
Operating revenue recorded charge, after tax | 22 |
Operating Segments | Virginia Electric and Power Company | Virginia Legislation |  |
Segment Reporting Information [Line Items] |  |
One-time rate credit amount |  | 215
One-time rate credit amount after tax |  | 160
Corporate and Other | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
After- tax net expenses | 1,600 | 238
Corporate and Other | Operating Segments | Virginia Electric and Power Company |  |
Segment Reporting Information [Line Items] |  |
After- tax net expenses | 344 | 197
Southeast Energy |  |
Segment Reporting Information [Line Items] |  |
Charge for refund of amounts from customers | 1,000 |
Charge for refund of amounts from customers, after tax | 756 |
Litigation settlement expense | 169 |
Litigation settlement expense, after tax | 127 |
Merger and integration related costs | 106 |
Merger and integration-related costs, after tax | 81 |
Charge for property, plant and equipment acquired but committed to forgo recovery | 105 |
Charge for property, plant and equipment acquired but committed to forgo recovery, after tax | 79 |
Power Generation | Virginia Electric and Power Company |  |
Segment Reporting Information [Line Items] |  |
Asset retirement obligations | 369 |
Asset retirement obligations, after tax | 275 |
Power Generation | Virginia Electric and Power Company | Virginia Legislation |  |
Segment Reporting Information [Line Items] |  |
Benefit from revision of future closure costs | 113 |
Benefit from revision of future closure costs, after tax | 84 |
Power Generation | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Gain loss on investments held in nuclear decommissioning trust funds | 253 | (43)
Other comprehensive income (loss), net of tax | 189 | (32)
Power Generation | Operating Segments | Virginia Electric and Power Company |  |
Segment Reporting Information [Line Items] |  |
Asset retirement obligations | 369 |
Asset retirement obligations, after tax | 275 |
Operating revenue recorded charge, after tax | 19 |
Power Generation | Operating Segments | Virginia Electric and Power Company | Virginia Legislation |  |
Segment Reporting Information [Line Items] |  |
Benefit from revision of future closure costs | 113 |
Benefit from revision of future closure costs, after tax | 84 |
Charge associated with one-time rate credits of certain amounts to utility customers, after tax |  | 109
Power Delivery | Virginia Electric and Power Company |  |
Segment Reporting Information [Line Items] |  |
Asset retirement obligations | 160 |
Asset retirement obligations, after tax | 119 |
Power Delivery | Operating Segments | Virginia Electric and Power Company |  |
Segment Reporting Information [Line Items] |  |
Asset retirement obligations | 160 |
Asset retirement obligations, after tax | 119 |
Operating revenue recorded charge, after tax | $ 3 |
Charge for storm damage and service restoration |  | 31
Charge for storm damage and service restoration, after tax |  | 23
Power Delivery | Operating Segments | Virginia Electric and Power Company | Virginia Legislation |  |
Segment Reporting Information [Line Items] |  |
Charge associated with one-time rate credits of certain amounts to utility customers, after tax |  | $ 51

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