Schedule I - Condensed Parent Company Financials (Tables)

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Schedule of Debt [Table Text Block]

Summary of Debt and Related Terms
		December 31, 2012
(in millions)		Weighted Average Interest Rate		Duke Energy		Duke Energy Carolinas		Progress Energy		Progress Energy Carolinas		Progress Energy Florida		Duke Energy Ohio		Duke Energy Indiana
Unsecured debt, maturing 2013 - 2039		5.44	%	$	12,722	$	1,159	$	4,150	$	―	$	150	$	805	$	1,146
Secured debt, maturing 2013 - 2037		3.08	%		1,873		300		5		5		―		―		―
First mortgage bonds, maturing 2013 - 2042(a)		5.00	%		17,856		6,562		8,775		4,025		4,750		700		1,819
Capital leases, maturing 2013 - 2051(b)		5.19	%		1,689		32		339		150		189		35		23
Junior subordinated debt, maturing 2039		7.10	%		309		―		309		―		―		―		―
Other debt, maturing 2027		4.77	%		8		―		―		―		―		8		―
Tax-exempt bonds, maturing 2014 - 2041(c)		1.39	%		2,357		395		910		669		241		479		573
Non-recourse notes payable of VIEs					312		―		―		―		―		―		―
Notes payable and commercial paper(d)		0.83	%		1,195		―		―		―		―		―		―
Money pool borrowings					―		300		455		364		―		245		231
Fair value hedge carrying value adjustment					12		10		―		―		―		2		―
Unamortized debt discount and premium, net(e)					2,185		(17)		(60)		(9)		(10)		(32)		(9)
Total debt(f)					40,518		8,741		14,883		5,204		5,320		2,242		3,783
Short-term notes payable and commercial paper					(745)		―		―		―		―		―		―
Short-term money pool borrowings					―		―		(455)		(364)		―		(245)		(81)
Current maturities of long-term debt					(3,110)		(406)		(843)		(407)		(435)		(261)		(405)
Short-term non-recourse notes payable of VIEs					(312)		―		―		―		―		―		―
Total long-term debt, including long-term debt of VIEs				$	36,351	$	8,335	$	13,585	$	4,433	$	4,885	$	1,736	$	3,297
(a)	Substantially all of the Duke Energy Registrants' electric and gas plant in service is mortgaged under mortgage bond indentures.
(b)	At December 31, 2012, capital leases of Duke Energy included $158 million and $907 million of capital lease purchase accounting adjustments for Progress Energy Carolinas and Progress Energy Florida, respectively, related to power purchase agreements that are not accounted for as leases on their financial statements because of grandfathering provisions in GAAP.
(c)	$1.558 billion, $360 million, $910 million, $669 million, $241 million and $288 million were secured by first mortgage bonds at Duke Energy, Duke Energy Carolinas, Progress Energy, Progress Energy Carolinas, Progress Energy Florida and Duke Energy Indiana, respectively, and $231 million, $27 million and $204 million were secured by a letter of credit at Duke Energy, Duke Energy Ohio, and Duke Energy Indiana, respectively.
(d)	Includes $450 million that was classified as Long-term Debt on the Consolidated Balance Sheets due to the existence of long-term credit facilities that back-stop these commercial paper balances, along with Duke Energy’s ability and intent to refinance these balances on a long-term basis. The weighted-average days to maturity was 18 days.
(e)	At December 31, 2012, $2.311 billion in purchase accounting adjustments related to the merger with Progress Energy were reflected in the balance for Duke Energy. See Note 2 for additional information.
(f)	Includes $451 million of debt for Duke Energy that was denominated in Brazilian Reals and $61 million denominated in Chilean Pesos.

		December 31, 2011
(in millions)		Weighted Average Interest Rate		Duke Energy		Duke Energy Carolinas		Progress Energy		Progress Energy Carolinas		Progress Energy Florida		Duke Energy Ohio		Duke Energy Indiana
Unsecured debt, maturing 2012 - 2039		5.93	%	$	8,961	$	2,313	$	4,650	$	500	$	150	$	1,305	$	1,148
Secured debt, maturing 2012 - 2035		3.70	%		1,118		300		―		―		―		―		―
First mortgage bonds, maturing 2013 - 2041(a)		5.24	%		8,182		5,913		7,125		3,025		4,100		700		1,569
Capital leases, maturing 2012 - 2047		8.10	%		306		34		211		12		199		44		27
Junior subordinated debt					―		―		309		―		―		―		―
Other debt, maturing 2014 - 2027		5.25	%		82		―		5		5		―		8		―
Tax exempt bonds, maturing 2012 - 2041(b)		1.40	%		1,515		415		910		669		241		525		574
Non-recourse notes payable of VIEs					273		―		―		―		―		―		―
Notes payable and commercial paper(c)		0.61	%		604		―		671		188		233		―		―
Money pool borrowings					―		300		―		31		8		―		450
Fair value hedge carrying value adjustment					19		13		―		―		―		7		―
Unamortized debt discount and premium, net					(60)		(14)		(58)		(5)		(9)		(34)		(9)
Total debt(d)					21,000		9,274		13,823		4,425		4,922		2,555		3,759
Short-term notes payable and commercial paper					(154)		―		(671)		(188)		(233)		―		―
Short-term money pool borrowings					―		―		―		(31)		(8)		―		(300)
Current maturities of long-term debt					(1,894)		(1,178)		(961)		(502)		(10)		(507)		(6)
Short-term non-recourse notes payable of VIEs					(273)		―		―		―		―		―		―
Total long-term debt, including long-term debt of VIEs				$	18,679	$	8,096	$	12,191	$	3,704	$	4,671	$	2,048	$	3,453
(a)	Substantially all of the Duke Energy Registrants' electric and gas plant in service is mortgaged under the mortgage bond indentures.
(b)	$650 million, $360 million, $910 million, $669 million, $241 million and $289 million were secured by first mortgage bonds at Duke Energy, Duke Energy Carolinas, Progress Energy, Progress Energy Carolinas, Progress Energy Florida and Duke Energy Indiana, respectively, and $231 million, $27 million and $204 million were secured by a letter of credit at Duke Energy, Duke Energy Ohio, and Duke Energy Indiana, respectively.
(c)	Includes $450 million that was classified as Long-term Debt on the Consolidated Balance Sheets due to the existence of long-term credit facilities that back-stop these commercial paper balances, along with Duke Energy’s ability and intent to refinance these balances on a long-term basis. The weighted-average days to maturity was 17 days.
(d)	Includes $420 million of debt for Duke Energy that was denominated in Brazilian Reals.

Schedule of Maturities of Long-term Debt [Table Text Block]

		December 31, 2012
(in millions)		Duke Energy(a)		Duke Energy Carolinas		Progress Energy		Progress Energy Carolinas		Progress Energy Florida		Duke Energy Ohio		Duke Energy Indiana
2013		$	3,098	$	406	$	843	$	407	$	435	$	261	$	405
2014			2,196		346		312		2		11		47		5
2015			2,478		506		1,262		701		561		7		5
2016			2,184		655		313		2		11		56		480
2017			1,321		116		311		51		261		2		3
Thereafter			25,873		6,712		11,387		3,677		4,041		1,624		2,804
Total long-term debt, including current maturities		$	37,150	$	8,741	$	14,428	$	4,840	$	5,320	$	1,997	$	3,702
(a)	At December 31, 2012, capital leases of Duke Energy included $158 million and $907 million of capital lease purchase accounting adjustments for Progress Energy Carolinas and Progress Energy Florida, respectively, related to power purchase agreements that are not accounted for as leases on their financial statements because of grandfathering provisions in GAAP.

Parent Company [Member]

Schedule of Debt [Table Text Block]

		Weighted-				December 31,
(in millions)		Average Rate		Year Due		2012		2011
Unsecured debt		4.1	%	2013 - 2026	$	4,929	$	3,773
Capital leases		7.8	%	2046		127		―
Intercompany borrowings(a)		0.5	%	2021		105		105
Notes payable and commercial paper(b)		0.5	%			1,195		604
Total debt						6,356		4,482
Short-term notes payable and commercial paper						(745)		(154)
Current maturities of long-term debt						(256)		―
Total long-term debt					$	5,355	$	4,328
(a)	This amount represents an intercompany loan with Duke Energy's affiliate, Bison Insurance Company Limited.
(b)	Includes $450 million at December 31, 2012 and 2011 that was classified as Long-term Debt on the Condensed Balance Sheets due to the existence of long-term credit facilities which back-stop these commercial paper balances, along with Duke Energy's ability and intent to refinance these balances on a long-term basis. The weighted-average days to maturity was 18 days and 17 days as of December 31, 2012 and 2011, respectively.

Schedule of Maturities of Long-term Debt [Table Text Block]

Annual Maturities as of December 31, 2012
(in millions)
2013	$	706
2014		1,249
2015		449
2016		499
2017		699
Thereafter		2,009
Total long-term debt, including current maturities	$	5,611