Significant Accounting Policies (Significant Accounting Policies)	9 Months Ended
Sep. 30, 2012
Policy Text Block [Line Items]
Basis of presentation	B. BASIS OF PRESENTATION These Unaudited Condensed Interim Financial Statements have been prepared in accordance with generally accepted accounting principles (GAAP) in the U.S. for interim financial information and with the instructions to Form 10-Q and Regulation S-X. Accordingly, these Unaudited Condensed Interim Financial Statements do not include all of the information and notes required by GAAP in the U.S. for annual financial statements. The December 31, 2011 condensed balance sheet data was derived from audited financial statements but does not include all disclosures required by GAAP. Because the Unaudited Condensed Interim Financial Statements and Notes do not include all of the information and notes required by GAAP in the U.S. for annual financial statements, the Unaudited Condensed Interim Financial Statements and other information included in this quarterly report should be read in conjunction with the respective Financial Statements and Notes in the Progress Energy Registrants' combined Form 10-K for the year ended December 31, 2011 (2011 Form 10-K). These Unaudited Condensed Interim Financial Statements reflect all normal recurring adjustments that are, in the opinion of the respective companies' management, necessary to fairly present the financial position and results of operations of each Progress Energy Registrant. Amounts reported in the Progress Energy Registrants' Statements of Operations and Comprehensive Income are not necessarily indicative of amounts expected for the respective annual periods due to the effects of seasonal temperature variations on energy consumption, regulatory rulings, the timing of maintenance on electric generating units, changes in mark-to-market valuations, changing commodity prices and other factors. The Unaudited Condensed Interim Financial Statements and Notes have been reclassified to conform with the Duke Energy format.
Consolidation of variable interest entities	VARIABLE INTEREST ENTITIES A variable interest entity (VIE) is an entity that is evaluated for consolidation using more than a simple analysis of voting control. The analysis to determine whether an entity is a VIE considers contracts with an entity, credit support for an entity, the adequacy of the equity investment of an entity and the relationship of voting power to the amount of equity invested in an entity. This analysis is performed either upon the creation of a legal entity or upon the occurrence of an event requiring reevaluation, such as a significant change in the entity's assets or activities. If an entity is determined to be a VIE, a qualitative analysis of control determines the party that consolidates a VIE based on what party has the power to direct the most significant activities of the VIE that impact its economic performance as well as what party has rights to receive benefits or is obligated to absorb losses that are significant to the VIE. The analysis of the party that consolidates a VIE is a continual reassessment.
Use of estimates and assumptions	C. USE OF ESTIMATES To conform to GAAP in the U.S., management makes estimates and assumptions that affect the amounts reported in the Unaudited Condensed Interim Financial Statements and Notes. Although these estimates are based on management's best available information at the time, actual results could differ.
Revenue recognition	D. UNBILLED REVENUE Revenues on sales of electricity are recognized when the service is provided to customers. Unbilled retail revenues are estimated by applying a weighted average revenue per kilowatt-hour for all customer classes to the number of estimated kilowatt-hours delivered but not billed. The amount of unbilled revenues can vary significantly from period to period as a result of numerous factors, including seasonality, weather, customer usage patterns and customer mix.
Excise taxes	EXCISE TAXES Certain excise taxes levied by state or local governments are collected by the Utilities from their customers. Taxes that are required to be paid regardless of the ability to collect from the customer are accounted for on a gross basis. When the Utilities act as an agent, and the tax is not required to be remitted if it is not collected from the customer, the taxes are accounted for on a net basis.
PEC [Member]
Policy Text Block [Line Items]
Basis of presentation	B. BASIS OF PRESENTATION These Unaudited Condensed Interim Financial Statements have been prepared in accordance with generally accepted accounting principles (GAAP) in the U.S. for interim financial information and with the instructions to Form 10-Q and Regulation S-X. Accordingly, these Unaudited Condensed Interim Financial Statements do not include all of the information and notes required by GAAP in the U.S. for annual financial statements. The December 31, 2011 condensed balance sheet data was derived from audited financial statements but does not include all disclosures required by GAAP. Because the Unaudited Condensed Interim Financial Statements and Notes do not include all of the information and notes required by GAAP in the U.S. for annual financial statements, the Unaudited Condensed Interim Financial Statements and other information included in this quarterly report should be read in conjunction with the respective Financial Statements and Notes in the Progress Energy Registrants' combined Form 10-K for the year ended December 31, 2011 (2011 Form 10-K). These Unaudited Condensed Interim Financial Statements reflect all normal recurring adjustments that are, in the opinion of the respective companies' management, necessary to fairly present the financial position and results of operations of each Progress Energy Registrant. Amounts reported in the Progress Energy Registrants' Statements of Operations and Comprehensive Income are not necessarily indicative of amounts expected for the respective annual periods due to the effects of seasonal temperature variations on energy consumption, regulatory rulings, the timing of maintenance on electric generating units, changes in mark-to-market valuations, changing commodity prices and other factors. The Unaudited Condensed Interim Financial Statements and Notes have been reclassified to conform with the Duke Energy format.
Consolidation of variable interest entities	VARIABLE INTEREST ENTITIES A variable interest entity (VIE) is an entity that is evaluated for consolidation using more than a simple analysis of voting control. The analysis to determine whether an entity is a VIE considers contracts with an entity, credit support for an entity, the adequacy of the equity investment of an entity and the relationship of voting power to the amount of equity invested in an entity. This analysis is performed either upon the creation of a legal entity or upon the occurrence of an event requiring reevaluation, such as a significant change in the entity's assets or activities. If an entity is determined to be a VIE, a qualitative analysis of control determines the party that consolidates a VIE based on what party has the power to direct the most significant activities of the VIE that impact its economic performance as well as what party has rights to receive benefits or is obligated to absorb losses that are significant to the VIE. The analysis of the party that consolidates a VIE is a continual reassessment.
Use of estimates and assumptions	C. USE OF ESTIMATES To conform to GAAP in the U.S., management makes estimates and assumptions that affect the amounts reported in the Unaudited Condensed Interim Financial Statements and Notes. Although these estimates are based on management's best available information at the time, actual results could differ.
Revenue recognition	D. UNBILLED REVENUE Revenues on sales of electricity are recognized when the service is provided to customers. Unbilled retail revenues are estimated by applying a weighted average revenue per kilowatt-hour for all customer classes to the number of estimated kilowatt-hours delivered but not billed. The amount of unbilled revenues can vary significantly from period to period as a result of numerous factors, including seasonality, weather, customer usage patterns and customer mix.
Excise taxes	EXCISE TAXES Certain excise taxes levied by state or local governments are collected by the Utilities from their customers. Taxes that are required to be paid regardless of the ability to collect from the customer are accounted for on a gross basis. When the Utilities act as an agent, and the tax is not required to be remitted if it is not collected from the customer, the taxes are accounted for on a net basis.
PEF [Member]
Policy Text Block [Line Items]
Basis of presentation	B. BASIS OF PRESENTATION These Unaudited Condensed Interim Financial Statements have been prepared in accordance with generally accepted accounting principles (GAAP) in the U.S. for interim financial information and with the instructions to Form 10-Q and Regulation S-X. Accordingly, these Unaudited Condensed Interim Financial Statements do not include all of the information and notes required by GAAP in the U.S. for annual financial statements. The December 31, 2011 condensed balance sheet data was derived from audited financial statements but does not include all disclosures required by GAAP. Because the Unaudited Condensed Interim Financial Statements and Notes do not include all of the information and notes required by GAAP in the U.S. for annual financial statements, the Unaudited Condensed Interim Financial Statements and other information included in this quarterly report should be read in conjunction with the respective Financial Statements and Notes in the Progress Energy Registrants' combined Form 10-K for the year ended December 31, 2011 (2011 Form 10-K). These Unaudited Condensed Interim Financial Statements reflect all normal recurring adjustments that are, in the opinion of the respective companies' management, necessary to fairly present the financial position and results of operations of each Progress Energy Registrant. Amounts reported in the Progress Energy Registrants' Statements of Operations and Comprehensive Income are not necessarily indicative of amounts expected for the respective annual periods due to the effects of seasonal temperature variations on energy consumption, regulatory rulings, the timing of maintenance on electric generating units, changes in mark-to-market valuations, changing commodity prices and other factors. The Unaudited Condensed Interim Financial Statements and Notes have been reclassified to conform with the Duke Energy format.
Consolidation of variable interest entities	VARIABLE INTEREST ENTITIES A variable interest entity (VIE) is an entity that is evaluated for consolidation using more than a simple analysis of voting control. The analysis to determine whether an entity is a VIE considers contracts with an entity, credit support for an entity, the adequacy of the equity investment of an entity and the relationship of voting power to the amount of equity invested in an entity. This analysis is performed either upon the creation of a legal entity or upon the occurrence of an event requiring reevaluation, such as a significant change in the entity's assets or activities. If an entity is determined to be a VIE, a qualitative analysis of control determines the party that consolidates a VIE based on what party has the power to direct the most significant activities of the VIE that impact its economic performance as well as what party has rights to receive benefits or is obligated to absorb losses that are significant to the VIE. The analysis of the party that consolidates a VIE is a continual reassessment.
Use of estimates and assumptions	C. USE OF ESTIMATES To conform to GAAP in the U.S., management makes estimates and assumptions that affect the amounts reported in the Unaudited Condensed Interim Financial Statements and Notes. Although these estimates are based on management's best available information at the time, actual results could differ.
Revenue recognition	D. UNBILLED REVENUE Revenues on sales of electricity are recognized when the service is provided to customers. Unbilled retail revenues are estimated by applying a weighted average revenue per kilowatt-hour for all customer classes to the number of estimated kilowatt-hours delivered but not billed. The amount of unbilled revenues can vary significantly from period to period as a result of numerous factors, including seasonality, weather, customer usage patterns and customer mix.
Excise taxes	EXCISE TAXES Certain excise taxes levied by state or local governments are collected by the Utilities from their customers. Taxes that are required to be paid regardless of the ability to collect from the customer are accounted for on a gross basis. When the Utilities act as an agent, and the tax is not required to be remitted if it is not collected from the customer, the taxes are accounted for on a net basis.

Significant Accounting Policies (Significant Accounting Policies)

9 Months Ended

Sep. 30, 2012

B. BASIS OF PRESENTATION

These Unaudited Condensed Interim Financial Statements have been prepared in accordance with generally accepted accounting principles (GAAP) in the U.S. for interim financial information and with the instructions to Form 10-Q and Regulation S-X. Accordingly, these Unaudited Condensed Interim Financial Statements do not include all of the information and notes required by GAAP in the U.S. for annual financial statements. The December 31, 2011 condensed balance sheet data was derived from audited financial statements but does not include all disclosures required by GAAP. Because the Unaudited Condensed Interim Financial Statements and Notes do not include all of the information and notes required by GAAP in the U.S. for annual financial statements, the Unaudited Condensed Interim Financial Statements and other information included in this quarterly report should be read in conjunction with the respective Financial Statements and Notes in the Progress Energy Registrants' combined Form 10-K for the year ended December 31, 2011 (2011 Form 10-K).

These Unaudited Condensed Interim Financial Statements reflect all normal recurring adjustments that are, in the opinion of the respective companies' management, necessary to fairly present the financial position and results of operations of each Progress Energy Registrant. Amounts reported in the Progress Energy Registrants' Statements of Operations and Comprehensive Income are not necessarily indicative of amounts expected for the respective annual periods due to the effects of seasonal temperature variations on energy consumption, regulatory rulings, the timing of maintenance on electric generating units, changes in mark-to-market valuations, changing commodity prices and other factors.

The Unaudited Condensed Interim Financial Statements and Notes have been reclassified to conform with the Duke Energy format.

Consolidation of variable interest entities

VARIABLE INTEREST ENTITIES

A variable interest entity (VIE) is an entity that is evaluated for consolidation using more than a simple analysis of voting control. The analysis to determine whether an entity is a VIE considers contracts with an entity, credit support for an entity, the adequacy of the equity investment of an entity and the relationship of voting power to the amount of equity invested in an entity. This analysis is performed either upon the creation of a legal entity or upon the occurrence of an event requiring reevaluation, such as a significant change in the entity's assets or activities. If an entity is determined to be a VIE, a qualitative analysis of control determines the party that consolidates a VIE based on what party has the power to direct the most significant activities of the VIE that impact its economic performance as well as what party has rights to receive benefits or is obligated to absorb losses that are significant to the VIE. The analysis of the party that consolidates a VIE is a continual reassessment.

Use of estimates and assumptions

C. USE OF ESTIMATES

To conform to GAAP in the U.S., management makes estimates and assumptions that affect the amounts reported in the Unaudited Condensed Interim Financial Statements and Notes. Although these estimates are based on management's best available information at the time, actual results could differ.

Revenue recognition

D. UNBILLED REVENUE

Revenues on sales of electricity are recognized when the service is provided to customers. Unbilled retail revenues are estimated by applying a weighted average revenue per kilowatt-hour for all customer classes to the number of estimated kilowatt-hours delivered but not billed. The amount of unbilled revenues can vary significantly from period to period as a result of numerous factors, including seasonality, weather, customer usage patterns and customer mix.

Excise taxes

EXCISE TAXES

Certain excise taxes levied by state or local governments are collected by the Utilities from their customers. Taxes that are required to be paid regardless of the ability to collect from the customer are accounted for on a gross basis. When the Utilities act as an agent, and the tax is not required to be remitted if it is not collected from the customer, the taxes are accounted for on a net basis.

PEC [Member]

Policy Text Block [Line Items]

Basis of presentation

B. BASIS OF PRESENTATION

The Unaudited Condensed Interim Financial Statements and Notes have been reclassified to conform with the Duke Energy format.

Consolidation of variable interest entities

VARIABLE INTEREST ENTITIES

Use of estimates and assumptions

C. USE OF ESTIMATES

Revenue recognition

D. UNBILLED REVENUE

Excise taxes

EXCISE TAXES

PEF [Member]

Policy Text Block [Line Items]

Basis of presentation

B. BASIS OF PRESENTATION

The Unaudited Condensed Interim Financial Statements and Notes have been reclassified to conform with the Duke Energy format.

Consolidation of variable interest entities

VARIABLE INTEREST ENTITIES

Use of estimates and assumptions

C. USE OF ESTIMATES

Revenue recognition

D. UNBILLED REVENUE

Excise taxes

EXCISE TAXES

- Definition

Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 2-6

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 3A

-Section 02, 03

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-URI http://asc.fasb.org/subtopic&trid=2197480

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 20

-Subparagraph a(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 97-2

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 96-16

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 46R

-Paragraph 4

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 46R

-Paragraph 4

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.3A-02)

-URI http://asc.fasb.org/extlink&oid=6959686&loc=d3e355033-122828

Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 46R

-Paragraph 14, 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph k

-Article 1

Reference 12: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 325

-SubTopic 20

-URI http://asc.fasb.org/subtopic&trid=2197087

Reference 13: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 40

-Section 45

-URI http://asc.fasb.org/section&trid=2197723

Reference 14: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-URI http://asc.fasb.org/subtopic&trid=2196966

Reference 15: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 5, 6, 16-19

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

Reference 17: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 46

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 18: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6382870&loc=d3e33801-111570

Reference 19: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6921930&loc=d3e5614-111684

+ Details

- Definition

Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction.

+ References+ Details

- Definition

Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.

+ References+ Details