| **Long-term Debt Instruments (Details) (North Carolina Utilities Commission [Member], USD $)** | 3 Months Ended                                                                                                                                             |
|------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------|
||
| North Carolina Utilities Commission [Member]                                                   |                                                                                                                                                       |
| **Debt Instrument [Line Items]**                                                               |                                                                                                                                                       |
| Public Utilities, Approved Debt Equity Securities Limit, Amount                                | $ 1,000,000,000pny_PublicUtilitiesApprovedDebtEquitySecuritiesLimitAmount/ us-gaap_RegulatoryAgencyAxis= pny_NorthCarolinaUtilitiesCommissionMember        |
| Debt and Equity Shelf Registration, Term                                                       | 3 years                                                                                                                                                    |
| Public Utilities, Approved Debt Equity Securities Limit, Amount Remaining                      | $ 750,000,000pny_PublicUtilitiesApprovedDebtEquitySecuritiesLimitAmountRemaining/ us-gaap_RegulatoryAgencyAxis= pny_NorthCarolinaUtilitiesCommissionMember |

| X                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Term in years of the approved debt and equity issuance limit of the Shelf Registration statement.
+ References
No definition available.
+ Details**Name:**pny_DebtandEquityShelfRegistrationTerm**Namespace Prefix:**pny_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of public utility's approved limit for debt and/or equity securities as permitted by its Shelf Registration.
+ References
No definition available.
+ Details**Name:**pny_PublicUtilitiesApprovedDebtEquitySecuritiesLimitAmount**Namespace Prefix:**pny_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Remaining amount of public utility's approved limit for debt and/or equity securities as permitted by its Shelf Registration.
+ References
No definition available.
+ Details**Name:**pny_PublicUtilitiesApprovedDebtEquitySecuritiesLimitAmountRemaining**Namespace Prefix:**pny_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_DebtInstrumentLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |