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Acquisitions and Dispositions (Schedule of Line of Credit Facilities) (Parenthetical) (Detail) - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |
Credit facility amount |  | $ 6,000,000,000 | [1] | $ 5,500,000,000
SCANA | Subsequent Event |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Repayment of letter of credit advances | $ 40,000,000 |  |  |
South Carolina [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Credit facility amount |  | $ 500,000,000 |  |
[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.

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