Organization and Basis of Presentation Organization and Basis of Presentation (Schedule of Excise Taxes) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Organization And Basis Of Presentation [Line Items]
Excise taxes collected	$ 151	$ 142	$ 318	$ 291
Duke Energy Carolinas [Member]
Organization And Basis Of Presentation [Line Items]
Excise taxes collected	43	37	89	78
Progress Energy [Member]
Organization And Basis Of Presentation [Line Items]
Excise taxes collected	74	73	151	141
Duke Energy Progress [Member]
Organization And Basis Of Presentation [Line Items]
Excise taxes collected	24	27	56	55
Duke Energy Florida [Member]
Organization And Basis Of Presentation [Line Items]
Excise taxes collected	50	46	95	86
Duke Energy Ohio [Member]
Organization And Basis Of Presentation [Line Items]
Excise taxes collected	25	24	59	55
Duke Energy Indiana [Member]
Organization And Basis Of Presentation [Line Items]
Excise taxes collected	$ 9	$ 8	$ 19	$ 17