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Acquisitions and Dispositions (Schedule of Long Term Debt) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Current maturities of long-term debt | [1],[2] | $ (3,624) | $ (3,078)
Unamortized discount, premium and debt issuance costs, net |  | (248) | $ (245)
SCANA |  |  |
Business Acquisition [Line Items] |  |  |
Total principal |  | 6,795 |
Current maturities of long-term debt |  | (59) |
Unamortized discount, premium and debt issuance costs, net |  | (29) |
Total long-term debt |  | 6,707 |
Variable rate debt |  | $ 68 |
Variable rate debt, interest rate |  | 1.72% |
SCANA | Unsecured Medium Term Notes due Two Thousand Twenty to Two Thousand Twenty Two [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Weighted- average Coupon (percentage) | [3] | 5.42% |
Total principal |  | $ 800 |
SCANA | Unsecured Senior Notes due Two Thousand Nineteen to Two Thousand Thirty Four [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Weighted- average Coupon (percentage) | [3] | 3.44% |
Total principal |  | $ 70 |
SCANA | First Mortgage Bonds due Two Thousand Twenty One to Two Thousand Sixty Five [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Weighted- average Coupon (percentage) | [3] | 5.52% |
Total principal |  | $ 4,990 |
SCANA | Genco Notes due Two Thousand Nineteen to Two Thousand Twenty Four [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Weighted- average Coupon (percentage) | [3] | 5.49% |
Total principal |  | $ 40 |
SCANA | Industrial and Pollution Control Bonds due Two Thousand Twenty Eight to Two Thousand Thirty Eight [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Weighted- average Coupon (percentage) | [3],[4] | 3.52% |
Total principal | [4] | $ 122 |
SCANA | Psnc Senior Debentures and Notes due Two Thousand Twenty to Two Thousand Forty Seven [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Weighted- average Coupon (percentage) | [3] | 5.07% |
Total principal |  | $ 700 |
SCANA | Others due Two Thousand Nineteen to Two Thousand Twenty Seven [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Weighted- average Coupon (percentage) | [3] | 3.46% |
Total principal |  | $ 73 |
[1] | 2017 excludes $250 million of Dominion Energy Questar Pipeline’s senior notes that matured in February 2018 using proceeds from the January 2018 issuance, through private placements, of $100 million and $150 million of senior notes that mature in 2028 and 2038, respectively.
[2] | Includes $20 million of estimated mandatory prepayments due within one year based on estimated cash flows in excess of debt service at SBL Holdco and Dominion Solar Projects III, Inc.
[3] | Represents weighted-average coupon rates for debt outstanding at closing of the SCANA Combination.
[4] | Includes variable rate debt of $68 million, with a weighted-average interest rate of 1.72%, which is hedged by fixed swaps

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