Debt and Credit Facilities (Summary of Debt Issuances) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Debt Instrument [Line Items]
Debt issuances	$ 1,875
April 2014 3.75% Senior Unsecured Notes Maturing April 2024 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt issuance date	Apr. 01, 2014
Debt maturity date	Apr. 01, 2024
Debt issuances	600	[1]
Interest rate	3.75%
April 2014 0.610% Senior Unsecured Floating Notes Maturing April 2017 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt issuance date	Apr. 01, 2014
Debt maturity date	Apr. 01, 2017
Debt issuances	400	[1]
Interest rate	0.61%
March 2014 0.850% Secured Credit Facility Maturing March 2017 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Debt issuance date	Mar. 13, 2014
Debt maturity date	Mar. 13, 2017
Debt issuances	225	[2]
Interest rate	0.85%
March 2014 4.375% First Mortgage Bonds Maturing March 2044 [Member] | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt issuance date	Mar. 31, 2014
Debt maturity date	Mar. 31, 2044
Debt issuances	400	[3]
Interest rate	4.375%
March 2014 0.450% First Mortgage Bonds Maturing March 2017 [Member] | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt issuance date	Mar. 31, 2014
Debt maturity date	Mar. 31, 2017
Debt issuances	250	[3]
Interest rate	0.435%
Duke Energy Progress [Member]
Debt Instrument [Line Items]
Debt issuances	650
Duke Energy Progress [Member] | March 2014 4.375% First Mortgage Bonds Maturing March 2044 [Member] | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt issuance date	Mar. 31, 2014
Debt maturity date	Mar. 31, 2044
Debt issuances	400	[3]
Interest rate	4.375%
Duke Energy Progress [Member] | March 2014 0.450% First Mortgage Bonds Maturing March 2017 [Member] | First Mortgage Bonds [Member]
Debt Instrument [Line Items]
Debt issuance date	Mar. 31, 2014
Debt maturity date	Mar. 31, 2017
Debt issuances	250	[3]
Interest rate	0.435%
Duke Energy Florida [Member]
Debt Instrument [Line Items]
Debt issuances	225
Duke Energy Florida [Member] | March 2014 0.850% Secured Credit Facility Maturing March 2017 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Debt issuance date	Mar. 13, 2014
Debt maturity date	Mar. 13, 2017
Debt issuances	225	[2]
Interest rate	0.85%
Parent Company [Member]
Debt Instrument [Line Items]
Debt issuances	1,000
Parent Company [Member] | April 2014 3.75% Senior Unsecured Notes Maturing April 2024 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt issuance date	Apr. 01, 2014
Debt maturity date	Apr. 01, 2024
Debt issuances	600	[1]
Interest rate	3.75%
Parent Company [Member] | April 2014 0.610% Senior Unsecured Floating Notes Maturing April 2017 [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt issuance date	Apr. 01, 2014
Debt maturity date	Apr. 01, 2017
Debt issuances	$ 400	[1]
Interest rate	0.61%

[1] Proceeds will be used to acquire $402 million of tax-exempt bonds at Duke Energy Ohio, the repayment of outstanding commercial paper and for general corporate purposes.

[2] Relates to the securitization of accounts receivable at a subsidiary of Duke Energy Florida. Proceeds were used to repay short-term borrowings under the intercompany money pool borrowing arrangement and for general corporate purposes. See Note 12 for further details.

[3] Proceeds were used to repay short-term borrowings under the intercompany money pool borrowing arrangement and for general corporate purposes.