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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