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Acquisitions and Dispositions (Schedule of Line of Credit Facilities) (Detail) - USD ($)
Dec. 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
SCANA Existing Facilities    
Business Acquisition [Line Items]    
Facility Limit 1,800,000,000  
Letters of credit advances 37,000,000  
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%  
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  
Letters of credit advances 37,000,000  
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%  
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 [3] 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 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.