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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.

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