New Accounting Standards	3 Months Ended
Mar. 31, 2013
New Accounting Standards [Abstract]
New Accounting Standards	19. NEW ACCOUNTING STANDARDS The following new accounting standards were adopted by the Duke Energy Registrants subsequent to March 31, 2012, and the impact of such adoption, if applicable, has been presented in the accompanying Condensed Consolidated Financial Statements: Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 210 — Balance Sheet In January 2013, the FASB issued revised accounting guidance to amend the existing disclosure requirements for offsetting financial assets and liabilities to enhance current disclosures, as well as to improve comparability of balance sheets prepared under U.S. GAAP and IFRS. The revised disclosure guidance affects all companies that have financial instruments and derivative instruments that are either offset in the balance sheet (i.e., presented on a net basis) or subject to an enforceable master netting arrangement and/or similar agreement. The revised guidance requires that certain enhanced quantitative and qualitative disclosures be made with respect to a company's netting arrangements and/or rights of setoff associated with its financial instruments and/or derivative instruments including associated collateral. For the Duke Energy Registrants, the revised disclosure guidance was effective on a retrospective basis for interim and annual periods beginning January 1, 2013. Other than additional disclosures, this revised guidance does not impact the Duke Energy Registrants' results of operations, cash flows or financial position. ASC 220 — Comprehensive Income In February 2013, the FASB amended the existing requirements for presenting comprehensive income in financial statements to improve the reporting of reclassifications out of AOCI. The amendments in this Update seek to attain that objective by requiring an entity to report the effect of significant reclassifications out of AOCI on the respective line items in net income if the amount being reclassified is required under U.S. GAAP to be reclassified in its entirety to net income. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety to net income in the same reporting period, an entity is required to cross-reference other disclosures required under U.S. GAAP that provide additional detail about those amounts. This would be the case when a portion of the amount reclassified out of AOCI is reclassified to a balance sheet account (for example, property, plant and equipment) instead of directly to income or expense in the same reporting period. For the Duke Energy Registrants, this revised guidance was effective on a prospective basis for interim and annual periods beginning January 1, 2013. Other than additional disclosures or a change in the presentation on the statement of comprehensive income, this revised guidance does not impact the Duke Energy Registrants' results of operations, cash flows or financial position. The following new Accounting Standards Update (ASU) has been issued, but has not yet been adopted by Duke Energy, as of March 31, 2013 ASC 830—Foreign Currency Matters. In March 2013, the FASB issued revised accounting guidance to resolve the diversity in practice about the release of the cumulative translation adjustment into net income when a parent either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets that is a business (other than a sale of in substance real estate) within a foreign entity. In addition, the amendments resolve the diversity in practice for the release of the cumulative translation adjustment involving business combinations achieved in stages by either a Duke investor or a third party acquirer. For the Duke Energy Registrants, the revised accounting guidance is effective on a prospective basis for interim and annual periods beginning January 1, 2014. The revised guidance will impact the timing of the recognition of the cumulative translation adjustment for certain future transactions and therefore, could impact the Duke Energy Registrants' results of operations, cash flows and financial position.

New Accounting Standards

3 Months Ended

Mar. 31, 2013

19. NEW ACCOUNTING STANDARDS

The following new accounting standards were adopted by the Duke Energy Registrants subsequent to March 31, 2012, and the impact of such adoption, if applicable, has been presented in the accompanying Condensed Consolidated Financial Statements:

Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 210 — Balance Sheet

In January 2013, the FASB issued revised accounting guidance to amend the existing disclosure requirements for offsetting financial assets and liabilities to enhance current disclosures, as well as to improve comparability of balance sheets prepared under U.S. GAAP and IFRS. The revised disclosure guidance affects all companies that have financial instruments and derivative instruments that are either offset in the balance sheet (i.e., presented on a net basis) or subject to an enforceable master netting arrangement and/or similar agreement. The revised guidance requires that certain enhanced quantitative and qualitative disclosures be made with respect to a company's netting arrangements and/or rights of setoff associated with its financial instruments and/or derivative instruments including associated collateral. For the Duke Energy Registrants, the revised disclosure guidance was effective on a retrospective basis for interim and annual periods beginning January 1, 2013. Other than additional disclosures, this revised guidance does not impact the Duke Energy Registrants' results of operations, cash flows or financial position.

ASC 220 — Comprehensive Income

In February 2013, the FASB amended the existing requirements for presenting comprehensive income in financial statements to improve the reporting of reclassifications out of AOCI. The amendments in this Update seek to attain that objective by requiring an entity to report the effect of significant reclassifications out of AOCI on the respective line items in net income if the amount being reclassified is required under U.S. GAAP to be reclassified in its entirety to net income. For other amounts that are not required under U.S. GAAP to be reclassified in their entirety to net income in the same reporting period, an entity is required to cross-reference other disclosures required under U.S. GAAP that provide additional detail about those amounts. This would be the case when a portion of the amount reclassified out of AOCI is reclassified to a balance sheet account (for example, property, plant and equipment) instead of directly to income or expense in the same reporting period. For the Duke Energy Registrants, this revised guidance was effective on a prospective basis for interim and annual periods beginning January 1, 2013. Other than additional disclosures or a change in the presentation on the statement of comprehensive income, this revised guidance does not impact the Duke Energy Registrants' results of operations, cash flows or financial position.

The following new Accounting Standards Update (ASU) has been issued, but has not yet been adopted by Duke Energy, as of March 31, 2013

ASC 830—Foreign Currency Matters. In March 2013, the FASB issued revised accounting guidance to resolve the diversity in practice about the release of the cumulative translation adjustment into net income when a parent either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets that is a business (other than a sale of in substance real estate) within a foreign entity. In addition, the amendments resolve the diversity in practice for the release of the cumulative translation adjustment involving business combinations achieved in stages by either a Duke investor or a third party acquirer. For the Duke Energy Registrants, the revised accounting guidance is effective on a prospective basis for interim and annual periods beginning January 1, 2014. The revised guidance will impact the timing of the recognition of the cumulative translation adjustment for certain future transactions and therefore, could impact the Duke Energy Registrants' results of operations, cash flows and financial position.

- Definition

The entire disclosure for reporting accounting changes and error corrections. It includes the conveyance of information necessary for a user of the Company's financial information to understand all aspects and required disclosure information concerning all changes and error corrections reported in the Company's financial statements for the period.

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