Committments and Contingencies (Schedule of Reserves and Insurance Recoveries) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Loss Contingencies [Line Items]
Reserves for legal matters	$ 824	[1],[2]	$ 846	[1],[2]
Probable insurance recoveries	649	[1],[3],[4]	781	[1],[3],[4]
Duke Energy Carolinas [Member]
Loss Contingencies [Line Items]
Reserves for legal matters	616	[1],[2]	751	[1],[2]
Probable insurance recoveries	649	[1],[3],[4]	781	[1],[3],[4]
Progress Energy [Member]
Loss Contingencies [Line Items]
Reserves for legal matters	78	[1]	79	[1]
Duke Energy Progress [Member]
Loss Contingencies [Line Items]
Reserves for legal matters	10	[1]	12	[1]
Duke Energy Florida [Member]
Loss Contingencies [Line Items]
Reserves for legal matters	43	[1],[5]	47	[1],[5]
Duke Energy Indiana [Member]
Loss Contingencies [Line Items]
Reserves for legal matters	$ 8	[1]	$ 8	[1]

[1] Classified in the respective Consolidated Balance Sheets in Other within Deferred Credits and Other Liabilities and Other within Current Liabilities.

[2] Includes reserves for asbestos-related injuries and damages claims.

[3] Classified in the respective Consolidated Balance Sheets in Other within Investments and Other Assets and Receivables.

[4] Relates to recoveries associated with asbestos-related injuries and damages claims.

[5] Includes workers' compensation claims.