Debt And Credit Facilities (Summary Of Debt Issuances) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
March 2013 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Interest Rate	3.796%
June 2013 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Interest Rate	1.009%
Duke Energy Carolinas [Member]
Debt Instrument [Line Items]
Total Issuances	$ 650		$ 1,500
Duke Energy Carolinas [Member] | September 2012 [Member] | September 2042 [Member]
Debt Instrument [Line Items]
First mortgage bonds issuances	650	[1]
Interest Rate	4.00%
Duke Energy Carolinas [Member] | December 2011 [Member] | December 2016 [Member]
Debt Instrument [Line Items]
First mortgage bonds issuances			350
Interest Rate			1.75%
Duke Energy Carolinas [Member] | December 2011 [Member] | December 2041 [Member]
Debt Instrument [Line Items]
First mortgage bonds issuances			650
Interest Rate			4.25%
Duke Energy Carolinas [Member] | May 2011 [Member] | June 2021 [Member]
Debt Instrument [Line Items]
First mortgage bonds issuances			500
Interest Rate			3.90%
Progress Energy Carolinas [Member]
Debt Instrument [Line Items]
Total Issuances	1,000		500
Progress Energy Carolinas [Member] | May 2012 [Member] | April 2022 [Member]
Debt Instrument [Line Items]
Interest Rate	2.80%
Progress Energy Carolinas [Member] | May 2012 [Member] | May 2022 [Member]
Debt Instrument [Line Items]
First mortgage bonds issuances	500	[2]
Progress Energy Carolinas [Member] | May 2012 [Member] | May 2042 [Member]
Debt Instrument [Line Items]
First mortgage bonds issuances	500	[2]
Interest Rate	4.10%
Progress Energy Carolinas [Member] | September 2011 [Member] | August 2021 [Member]
Debt Instrument [Line Items]
First mortgage bonds issuances			500
Interest Rate			3.00%
Progress Energy Florida [Member]
Debt Instrument [Line Items]
Total Issuances	650		300
Progress Energy Florida [Member] | March 2013 [Member] | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	4.80%
Progress Energy Florida [Member] | November 2012 [Member] | November 2015 [Member]
Debt Instrument [Line Items]
First mortgage bonds issuances	250	[3]
Interest Rate	0.65%
Progress Energy Florida [Member] | November 2012 [Member] | November 2042 [Member]
Debt Instrument [Line Items]
First mortgage bonds issuances	400	[3]
Interest Rate	3.85%
Progress Energy Florida [Member] | August 2011 [Member] | September 2021 [Member]
Debt Instrument [Line Items]
First mortgage bonds issuances			300
Interest Rate			3.10%
Duke Energy Ohio [Member] | June 2013 [Member] | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Interest Rate	2.10%
Duke Energy Indiana [Member]
Debt Instrument [Line Items]
Total Issuances	250
Duke Energy Indiana [Member] | March 2012 [Member] | March 2042 [Member]
Debt Instrument [Line Items]
First mortgage bonds issuances	250	[4]
Interest Rate	4.20%
Parent Company [Member]
Debt Instrument [Line Items]
Total Issuances	2,343		1,000
Parent Company [Member] | December 2012 [Member] | March 2013 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured debt issuances	203	[5]
Parent Company [Member] | December 2012 [Member] | June 2013 [Member]
Debt Instrument [Line Items]
Secured debt issuances	190	[6]
Parent Company [Member] | December 2012 [Member] | December 2025 [Member]
Debt Instrument [Line Items]
Secured debt issuances	200	[6]
Interest Rate	1.56%
Parent Company [Member] | December 2012 B [Member] | March 2013 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured debt issuances	220	[5]
Parent Company [Member] | December 2012 B [Member] | June 2013 [Member]
Debt Instrument [Line Items]
Interest Rate	1.01%
Parent Company [Member] | August 2012 [Member] | August 2017 [Member]
Debt Instrument [Line Items]
Unsecured debt issuances	700	[7]
Interest Rate	1.63%
Parent Company [Member] | August 2012 [Member] | August 2022 [Member]
Debt Instrument [Line Items]
Unsecured debt issuances	500	[7]
Interest Rate	3.05%
Parent Company [Member] | April 2012 [Member] | September 2024 [Member]
Debt Instrument [Line Items]
Secured debt issuances	330	[8]
Interest Rate	2.64%
Parent Company [Member] | November 2011 [Member] | November 2016 [Member]
Debt Instrument [Line Items]
Unsecured debt issuances			500
Interest Rate			2.15%
Parent Company [Member] | August 2011 [Member] | September 2021 [Member]
Debt Instrument [Line Items]
Unsecured debt issuances			500
Interest Rate			3.55%
Parent Company [Member] | January 2011 [Member] | January 2021 [Member]
Debt Instrument [Line Items]
Interest Rate			4.40%
PGN Parent [Member]
Debt Instrument [Line Items]
Total Issuances	450		500
PGN Parent [Member] | March 2012 [Member] | April 2022 [Member]
Debt Instrument [Line Items]
Unsecured debt issuances	450	[9]
Interest Rate	3.15%
PGN Parent [Member] | January 2011 [Member] | January 2021 [Member]
Debt Instrument [Line Items]
Unsecured debt issuances			$ 500

[1] Proceeds from the issuance were used to repay at maturity the $420 million debentures due through November 2012, as well as for general corporate purposes, including the funding of capital expenditures.

[2] Proceeds from the issuances were used to repay at maturity $500 million of 6.50% senior unsecured notes due July 15, 2012 and a portion of Progress Energy Carolinas outstanding commercial paper and notes payable to affiliated companies.

[3] Proceeds from the issuances will be used to repay $425 million 4.80% first mortgage bonds due March 1, 2013, as well as for general corporate purposes.

[4] Proceeds from the issuance were used to repay a portion of outstanding short-term debt.

[5] Proceeds from the issuances were used to fund the existing Los Vientos wind power portfolio.

[6] Debt issuances were executed in connection with the acquisition of Ibener. Both loans are collateralized with cash deposits equal to 101% of the loan amounts. See Note 2 for further details.

[7] Proceeds from the issuances were used to repay at maturity $500 million of debentures due September 15, 2012, as well as for general corporate purposes, including the repayment of commercial paper.

[8] Proceeds from the issuance were used to reimburse construction costs for DS Cornerstone, LLC joint venture wind projects. Note was subsequently deconsolidated upon execution of joint venture. See Note 18 for further details.

[9] The net proceeds, along with available cash on hand, were used to repay $450 million 6.85% senior unsecured notes due April 15, 2012.