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Acquisitions and Dispositions (Schedule of Line of Credit Facilities) (Detail) - USD ($)
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Facility Limit $ 6,000,000,000 [1]   $ 5,500,000,000
Letters of credit advances 88,000,000 [1]   76,000,000
Facility capacity available 5,588,000,000 [1]   $ 2,126,000,000
Letter of Credit      
Business Acquisition [Line Items]      
Facility Limit   $ 250,000,000  
Commercial Paper      
Business Acquisition [Line Items]      
Facility Limit 2,000,000,000.0    
SCANA Existing Facilities      
Business Acquisition [Line Items]      
Facility Limit 1,800,000,000    
Facility capacity available 1,550,000,000    
SCANA Existing Facilities | Letter of Credit      
Business Acquisition [Line Items]      
Letters of credit advances $ 40,000,000    
Weighted-average interest rate 3.87%    
Outstanding commercial paper $ 37,000,000    
SCANA Existing Facilities | Commercial Paper      
Business Acquisition [Line Items]      
Weighted-average interest rate 3.63%    
Outstanding commercial paper $ 173,000,000    
SCANA Existing Facilities | SCANA      
Business Acquisition [Line Items]      
Facility Limit 400,000,000    
Facility capacity available 321,000,000    
SCANA Existing Facilities | SCANA | Letter of Credit      
Business Acquisition [Line Items]      
Letters of credit advances [2] $ 40,000,000    
Weighted-average interest rate 3.87%    
Outstanding commercial paper $ 37,000,000    
SCANA Existing Facilities | SCANA | Commercial Paper      
Business Acquisition [Line Items]      
Weighted-average interest rate 3.65%    
Outstanding commercial paper $ 2,000,000    
SCANA Existing Facilities | SCE&G [Member]      
Business Acquisition [Line Items]      
Facility Limit 1,200,000,000    
Facility capacity available $ 1,127,000,000    
SCANA Existing Facilities | SCE&G [Member] | Commercial Paper      
Business Acquisition [Line Items]      
Weighted-average interest rate 3.82%    
Outstanding commercial paper $ 73,000,000    
SCANA Existing Facilities | PSNC [Member]      
Business Acquisition [Line Items]      
Facility Limit [3] 200,000,000    
Facility capacity available $ 102,000,000    
SCANA Existing Facilities | PSNC [Member] | Commercial Paper      
Business Acquisition [Line Items]      
Weighted-average interest rate 3.49%    
Outstanding commercial paper $ 98,000,000    
[1] This credit facility matures in March 2023 and can be used by the Companies to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.
[2] In January 2019, SCANA repaid $40 million in letter of credit advances.
[3] Includes South Carolina Fuel Company, Inc.'s $500 million credit facility.