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Debt And Credit Facilities (Annual Maturities) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Current Maturities Of Long Term Debt [Abstract] |  |  |
Current maturities of long-term debt | $ 3,323 |  | $ 3,110
Secured Debt [Member] | June 2013 [Member] |  |  |
Current Maturities Of Long Term Debt [Abstract] |  |  |
Current maturities of long-term debt | 190 | [1] |
Interest Rate | 1.009% |  |
Other [Member] |  |  |
Current Maturities Of Long Term Debt [Abstract] |  |  |
Current maturities of long-term debt | 383 |  |
Duke Energy Carolinas [Member] |  |  |
Current Maturities Of Long Term Debt [Abstract] |  |  |
Current maturities of long-term debt | 406 |  | 406
Duke Energy Carolinas [Member] | First Mortgage Bonds [Member] | November 2013 [Member] |  |  |
Current Maturities Of Long Term Debt [Abstract] |  |  |
Current maturities of long-term debt | 400 |  |
Interest Rate | 5.75% |  |
Progress Energy [Member] |  |  |
Current Maturities Of Long Term Debt [Abstract] |  |  |
Current maturities of long-term debt | 718 |  | 843
Duke Energy Progress [Member] |  |  |
Current Maturities Of Long Term Debt [Abstract] |  |  |
Current maturities of long-term debt | 407 |  | 407
Duke Energy Progress [Member] | First Mortgage Bonds [Member] | September 2013 [Member] |  |  |
Current Maturities Of Long Term Debt [Abstract] |  |  |
Current maturities of long-term debt | 400 |  |
Interest Rate | 5.125% |  |
Duke Energy Florida [Member] |  |  |
Current Maturities Of Long Term Debt [Abstract] |  |  |
Current maturities of long-term debt | 10 |  | 435
Duke Energy Ohio [Member] |  |  |
Current Maturities Of Long Term Debt [Abstract] |  |  |
Current maturities of long-term debt | 259 |  | 261
Duke Energy Ohio [Member] | First Mortgage Bonds [Member] | June 2013 [Member] |  |  |
Current Maturities Of Long Term Debt [Abstract] |  |  |
Current maturities of long-term debt | 250 |  |
Interest Rate | 2.10% |  |
Duke Energy Indiana [Member] |  |  |
Current Maturities Of Long Term Debt [Abstract] |  |  |
Current maturities of long-term debt | 405 |  | 405
Duke Energy Indiana [Member] | Unsecured Debt [Member] | September 2013 [Member] |  |  |
Current Maturities Of Long Term Debt [Abstract] |  |  |
Current maturities of long-term debt | 400 |  |
Interest Rate | 5.00% |  |
Parent Company [Member] | Unsecured Debt [Member] | June 2013 [Member] |  |  |
Current Maturities Of Long Term Debt [Abstract] |  |  |
Current maturities of long-term debt | 250 |  |
Interest Rate | 5.65% |  |
Parent Company [Member] | Unsecured Debt [Member] | February 2014 [Member] |  |  |
Current Maturities Of Long Term Debt [Abstract] |  |  |
Current maturities of long-term debt | 750 |  |
Interest Rate | 6.30% |  |
PGN Parent [Member] | Unsecured Debt [Member] | March 2014 [Member] |  |  |
Current Maturities Of Long Term Debt [Abstract] |  |  |
Current maturities of long-term debt | $ 300 |  |
Interest Rate | 6.05% |  |
[1] | Notes were fully offset with cash collateral, which was presented within Current Assets on the Condensed Consolidated Balance Sheets as of March 31, 2013 and December 31, 2012. All collateral was returned when the six-month bridge loan was replaced with a $230 million non-recourse secured credit facility issued in April 2013. See Note 2 for additional information.

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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, scheduled 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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