Debt and Credit Facilities (Summary of Debt and Related Terms) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Unsecured Debt	$ 13,550		$ 12,722
Secured Debt	2,559		1,873
First mortgage bonds	17,831	[1]	17,856	[1]
Capital leases	1,516		1,689
Junior subordinated debt			309
Other debt	8		8
Tax exempt bonds	2,356	[2]	2,357	[2]
Notes Payable And Commercial Paper	1,289	[3]	1,507	[4]
Fair value hedge carrying value adjustment	9		12
Unamortized debt discount and premium, net	1,977	[5]	2,185	[6]
Total debt	41,095		40,518
Short-term notes payable and commercial paper	(839)		(1,057)
Current maturities of long-term debt	(2,104)		(3,110)
Total long-term debt	38,152	[7]	36,351	[8]
Derf [Member]
Debt Instrument [Line Items]
Short term obligations classified as long-term debt			300	[9]
Unsecured Debt [Member]
Debt Instrument [Line Items]
Weighted-average rate	5.18%		5.44%
Debt maturity date, start	Dec. 31, 2014		Dec. 31, 2013
Debt maturity date, end	Dec. 31, 2073		Dec. 31, 2039
Secured Debt [Member]
Debt Instrument [Line Items]
Weighted-average rate	2.69%		3.08%
Debt maturity date, start	Dec. 31, 2014		Dec. 31, 2013
Debt maturity date, end	Dec. 31, 2037		Dec. 31, 2037
First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Weighted-average rate	4.90%		5.00%
Debt maturity date, start	Dec. 31, 2015		Dec. 31, 2013
Debt maturity date, end	Dec. 31, 2043		Dec. 31, 2042
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Weighted-average rate	5.23%		5.19%
Debt maturity date, start	Dec. 31, 2014		Dec. 31, 2013
Debt maturity date, end	Dec. 31, 2051		Dec. 31, 2051
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Weighted-average rate			7.10%
Debt maturity date, end			Dec. 31, 2039
Other Debt [Member]
Debt Instrument [Line Items]
Weighted-average rate	4.77%		4.77%
Debt maturity date, end	Dec. 31, 2027		Dec. 31, 2027
Tax Exempt Bonds [Member]
Debt Instrument [Line Items]
Weighted-average rate	1.28%		1.39%
Debt maturity date, start	Dec. 31, 2014		Dec. 31, 2014
Debt maturity date, end	Dec. 31, 2041		Dec. 31, 2041
Short term obligations classified as long-term debt	471		471
Non-Recourse Notes Payable Of VIEs [Member]
Debt Instrument [Line Items]
Total long-term debt	1,966		852
Notes Payable And Commercial Paper [Member]
Debt Instrument [Line Items]
Weighted-average rate	1.02%		0.83%
Short term obligations classified as long-term debt	450		450
Revolving Loan [Member]
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	200	[10]	200	[10]
Purchase Accounting Adjustments [Member]
Debt Instrument [Line Items]
Unamortized debt discount and premium, net	2,067		2,311
Duke Energy Carolinas [Member]
Debt Instrument [Line Items]
Unsecured Debt	1,157		1,159
Secured Debt	400		300
First mortgage bonds	6,161	[1]	6,562	[1]
Capital leases	30		32
Tax exempt bonds	395	[2]	395	[2]
Money pool borrowings	300		300
Fair value hedge carrying value adjustment	9		10
Unamortized debt discount and premium, net	(16)		(17)
Total debt	8,436		8,741
Current maturities of long-term debt	(47)		(406)
Total long-term debt	8,389	[7]	8,335	[8]
Duke Energy Carolinas [Member] | Derf [Member]
Debt Instrument [Line Items]
Short term obligations classified as long-term debt			300	[9]
Duke Energy Carolinas [Member] | Tax Exempt Bonds [Member]
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	75		75
Duke Energy Carolinas [Member] | Non-Recourse Notes Payable Of VIEs [Member]
Debt Instrument [Line Items]
Total long-term debt	400		300
Duke Energy Carolinas [Member] | Notes Payable And Commercial Paper [Member]
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	300		300
Progress Energy [Member]
Debt Instrument [Line Items]
Unsecured Debt	4,150		4,150
Secured Debt	305		5
First mortgage bonds	8,450	[1]	8,775	[1]
Capital leases	327		339
Junior subordinated debt			309
Tax exempt bonds	910	[2]	910	[2]
Money pool borrowings	1,213		455
Unamortized debt discount and premium, net	(27)		(60)
Total debt	15,328		14,883
Short-term money pool borrowings	(1,213)		(455)
Current maturities of long-term debt	(485)		(843)
Total long-term debt	13,630	[7]	13,585
Progress Energy [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Weighted-average rate			7.10%
Progress Energy [Member] | Non-Recourse Notes Payable Of VIEs [Member]
Debt Instrument [Line Items]
Total long-term debt	300
Duke Energy Progress [Member]
Debt Instrument [Line Items]
Secured Debt	305		5
First mortgage bonds	4,125	[1]	4,025	[1]
Capital leases	148	[11]	150	[12]
Tax exempt bonds	669	[2]	669	[2]
Money pool borrowings	462		364
Unamortized debt discount and premium, net	(12)		(9)
Total debt	5,697		5,204
Short-term money pool borrowings	(462)		(364)
Current maturities of long-term debt	(174)		(407)
Total long-term debt	5,061	[7]	4,433
Duke Energy Progress [Member] | Non-Recourse Notes Payable Of VIEs [Member]
Debt Instrument [Line Items]
Total long-term debt	300
Duke Energy Progress [Member] | Purchase Accounting Adjustments [Member]
Debt Instrument [Line Items]
Capital leases	144		158
Duke Energy Florida [Member]
Debt Instrument [Line Items]
Unsecured Debt	150		150
First mortgage bonds	4,325	[1]	4,750	[1]
Capital leases	179	[11]	189	[12]
Tax exempt bonds	241	[2]	241	[2]
Money pool borrowings	181
Unamortized debt discount and premium, net	(9)		(10)
Total debt	5,067		5,320
Short-term money pool borrowings	(181)		0
Current maturities of long-term debt	(11)		(435)
Total long-term debt	4,875		4,885
Duke Energy Florida [Member] | Purchase Accounting Adjustments [Member]
Debt Instrument [Line Items]
Capital leases	838		907
Duke Energy Ohio [Member]
Debt Instrument [Line Items]
Unsecured Debt	805		805
First mortgage bonds	900	[1]	700	[1]
Capital leases	27		35
Other debt	8		8
Tax exempt bonds	479	[2]	479	[2]
Money pool borrowings	43		245
Fair value hedge carrying value adjustment			2
Unamortized debt discount and premium, net	(31)		(32)
Total debt	2,231		2,242
Short-term money pool borrowings	(43)		(245)
Current maturities of long-term debt	(47)		(261)
Total long-term debt	2,141		1,736
Duke Energy Ohio [Member] | Tax Exempt Bonds [Member]
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	111		111
Duke Energy Indiana [Member]
Debt Instrument [Line Items]
Unsecured Debt	744		1,146
First mortgage bonds	2,319	[1]	1,819	[1]
Capital leases	20		23
Tax exempt bonds	573	[2]	573	[2]
Money pool borrowings	150		231
Unamortized debt discount and premium, net	(10)		(9)
Total debt	3,796		3,783
Short-term money pool borrowings	0		(81)
Current maturities of long-term debt	(5)		(405)
Total long-term debt	3,791		3,297
Duke Energy Indiana [Member] | Tax Exempt Bonds [Member]
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	285		285
Duke Energy Indiana [Member] | Notes Payable And Commercial Paper [Member]
Debt Instrument [Line Items]
Short term obligations classified as long-term debt	$ 150		$ 150

[1] Substantially all electric utility fixed assets are mortgaged under mortgage bond indentures.

[2] Substantially all tax-exempt bonds are secured by first mortgage bonds or letters of credit.

[3] 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 49 days.

[4] 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.

[5] Duke Energy includes $2,067 million in purchase accounting adjustments related to the merger with Progress Energy. See Note 2 for additional information.

[6] Duke Energy includes $2,311 million in purchase accounting adjustments related to the merger with Progress Energy. See Note 2 for additional information.

[7] Includes $1,966 million for Duke Energy, $400 million for Duke Energy Carolinas and $300 million for Progress Energy and Duke Energy Progress related to consolidated VIEs.

[8] Includes $852 million for Duke Energy and $300 million for Duke Energy Carolinas related to consolidated VIEs.

[9] Duke Energy Receivables Finance Company, LLC (DERF) is a wholly owned limited liability company of Duke Energy Carolinas. See Note 17 for further information.

[10] Instrument has a term of less than one year with the right to extend the maturity date for additional one-year periods with a final maturity date no later than December 2026.

[11] Duke Energy includes $144 million and $838 million of capital lease purchase accounting adjustments related to Duke Energy Progress and Duke Energy Florida, respectively, related to power purchase agreements that are not accounted for as leases in their financial statements because of grandfathering provisions in GAAP.

[12] Duke Energy includes $158 million and $907 million of capital lease purchase accounting adjustments for Duke Energy Progress and Duke 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.