| **Long-term Debt Instruments (Details) - USD ($)**                        |                |              | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                           |        |
|---------------------------------------------------------------------------|----------------|--------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|
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| **Debt Instrument [Line Items]**                                          |           |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| Repayment of long-term debt                                               |           |         | $ 40,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                             | $ 0    |   |
| Principal                                                                 |           |         | 1,835,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                            |   | $ 1,575,000,000 |
| Unamortized debt issuance expenses and discounts                          |           |         | (13,816,000)                                                                                                                                                                                                                                                                                                                                                                                                                                             |   | (11,323,000) |
| Total Long-term Debt                                                      |           |         | 1,821,184,000                                                                                                                                                                                                                                                                                                                                                                                                                                            |   | 1,563,677,000 |
| Current maturities of long-term debt                                      |           |         | 0                                                                                                                                                                                                                                                                                                                                                                                                                                                        |   | 40,000,000 |
| Long-term Debt, excluding Current Maturities                              |           |         | $ 1,821,184,000                                                                                                                                                                                                                                                                                                                                                                                                                                          |   | $ 1,523,677,000 |
| Senior Notes 2.92%                                                        |           |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| **Debt Instrument [Line Items]**                                          |           |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| Repayment of long-term debt                                               |           | $ 40,000,000 |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| Senior Notes 3.64%                                                        |           |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| **Debt Instrument [Line Items]**                                          |           |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| Debt Instrument, Maturity Date                                            |           |         | Nov.  01,  2046                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |   |
| Debt Instrument, Interest Rate, Stated Percentage                         | 3.64%          |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| Debt Instrument, Issuance Date                                            | Jul. 28,  2016 |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| Debt Instrument, Face Amount                                              | $ 300,000,000  |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| Debt Issuance Discount Percentage                                         | 0.122%         |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| Debt Instrument, Unamortized Discount                                     | $ 366,000      |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| Proceeds from Debt, Net of Issuance Costs                                 | $ 297,000,000  |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| Senior Notes 3.64% | Debt Instrument, Redemption, Period One              |           |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| **Debt Instrument [Line Items]**                                          |           |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| Debt Instrument, Redemption Period, End Date                              |           |         | Apr. 30,  2046                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |   |
| Debt Instrument, Redemption, Description                                  |           |         | redemption price equal to the greater of a) 100% of the principal amount of the notes to be redeemed, and b) the sum of the present values of the remaining scheduled payments of principal and interest on the notes to be redeemed, discounted to the date of redemption on a semi-annual basis at the Treasury Rate as defined in the indenture, as supplemented, plus 25 basis points and any accrued and unpaid interest to the date of redemption. |   |   |
| Debt Instrument, Redemption Period, Start Date                            |           |         | Jul. 28,  2016                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |   |
| Debt Instrument, Redemption Price, Percentage                             |           |         | 100.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                  |   |   |
| Senior Notes 3.64% | Debt Instrument, Redemption, Period One | Base Rate  |           |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| **Debt Instrument [Line Items]**                                          |           |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| Debt Instrument, Basis Spread on Variable Rate                            |           |         | 0.25%                                                                                                                                                                                                                                                                                                                                                                                                                                                    |   |   |
| Senior Notes 3.64% | Debt Instrument, Redemption, Period Two              |           |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| **Debt Instrument [Line Items]**                                          |           |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| Debt Instrument, Redemption Period, End Date                              |           |         | Oct. 31,  2046                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |   |
| Debt Instrument, Redemption, Description                                  |           |         | 100% of the principal amount plus any accrued and unpaid interest to the date of redemption                                                                                                                                                                                                                                                                                                                                                              |   |   |
| Debt Instrument, Redemption Period, Start Date                            |           |         | May  01,  2046                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |   |
| Debt Instrument, Redemption Price, Percentage                             |           |         | 100.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                  |   |   |
| North Carolina Utilities Commission                                       |           |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| **Debt Instrument [Line Items]**                                          |           |         |                                                                                                                                                                                                                                                                                                                                                                                                                                                     |   |   |
| Public Utilities, Approved Debt Equity Securities Limit, Amount           |           |         | $ 1,000,000,000                                                                                                                                                                                                                                                                                                                                                                                                                                          |   |   |
| Public Utilities, Approved Debt Equity Securities Limit, Amount Remaining |           |         | $ 244,100,000                                                                                                                                                                                                                                                                                                                                                                                                                                            |   |   |

| X                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of debt discount at issuance as a percentage of the face value of the note issued.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of public utility's approved limit for debt and/or equity securities as permitted by its Shelf Registration.
+ References
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| - Definition
Remaining amount of public utility's approved limit for debt and/or equity securities as permitted by its Shelf Registration.
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| X                                                                                                                                                                                                                                                                                                                                 |
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| - Definition
Percentage points added to the reference rate to compute the variable rate on the debt instrument.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Face (par) amount of debt instrument at time of issuance.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
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| - Definition
Contractual interest rate for funds borrowed, under the debt agreement.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
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| - Definition
Date the debt instrument was issued, in CCYY-MM-DD format.
+ References
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.
+ References
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| - Definition
Description of debt redemption features under terms of the debt agreement.
+ References
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| - Definition
End date of debt instrument redemption period, in CCYY-MM-DD format.
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| - Definition
Start date of debt instrument redemption period, in CCYY-MM-DD format.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
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| - Definition
Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.
+ References
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| - Definition
Amount, after accumulated amortization, of debt discount.
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| - Definition
Amount of unamortized debt discount (premium) and debt issuance costs.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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| - Definition
Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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| - Definition
The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.
+ References
No definition available.
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| - Definition
The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.
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