Organization and Basis of Presentation (Schedule of Unbilled Revenues with Restricted Receivables) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Unbilled Receivables [Abstract]
Unbilled receivables, current	$ 856		$ 856		$ 920
Income Amounts Attributable to Parent, Disclosures [Abstract]
Net income (loss) attributable to Duke Energy Corporation	1,004	594	1,977	1,333
Duke Energy Carolinas [Member]
Unbilled Receivables [Abstract]
Unbilled receivables, current	288		288		315
Progress Energy [Member]
Unbilled Receivables [Abstract]
Unbilled receivables, current	220		220		187
Income Amounts Attributable to Parent, Disclosures [Abstract]
Net income (loss) attributable to Duke Energy Corporation	341	155	477	368
Duke Energy Progress [Member]
Unbilled Receivables [Abstract]
Unbilled receivables, current	120		120		112
Duke Energy Florida [Member]
Unbilled Receivables [Abstract]
Unbilled receivables, current	100		100		74
Duke Energy Ohio [Member]
Unbilled Receivables [Abstract]
Unbilled receivables, current	33		33		47
Duke Energy Ohio [Member] | CRC [Member]
Unbilled Receivables [Abstract]
Unbilled receivables, current	65		65		90
Duke Energy Indiana [Member]
Unbilled Receivables [Abstract]
Unbilled receivables, current	3		3		3
Duke Energy Indiana [Member] | CRC [Member]
Unbilled Receivables [Abstract]
Unbilled receivables, current	$ 126		$ 126		$ 132