Organization And Basis Of Presentation (Schedule Of Unbilled Revenues With Restricted Receivables) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Unbilled revenues within restricted receivables of variable interest entities and receivables	$ 822	$ 674
Duke Energy Carolinas [Member]
Unbilled revenues within restricted receivables of variable interest entities and receivables	282	293
Duke Energy Ohio [Member]
Unbilled revenues within restricted receivables of variable interest entities and receivables	36	50
Unbilled revenues sold to CRC	63	89
Duke Energy Indiana [Member]
Unbilled revenues within restricted receivables of variable interest entities and receivables	3	2
Unbilled revenues sold to CRC	$ 110	$ 115