Organization and Basis of Presentation (Schedule of Unbilled Revenues with Restricted Receivables) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Unbilled Receivables [Abstract]
Unbilled receivables, current	$ 816		$ 937
Excise Taxes [Abstract]
Excise Taxes Collected	167	149
Duke Energy Carolinas [Member]
Unbilled Receivables [Abstract]
Unbilled receivables, current	312		323
Excise Taxes [Abstract]
Excise Taxes Collected	46	42
Progress Energy [Member]
Unbilled Receivables [Abstract]
Unbilled receivables, current	203		189
Excise Taxes [Abstract]
Excise Taxes Collected	77	67
Duke Energy Progress [Member]
Unbilled Receivables [Abstract]
Unbilled receivables, current	120		120
Excise Taxes [Abstract]
Excise Taxes Collected	32	28
Duke Energy Florida [Member]
Unbilled Receivables [Abstract]
Unbilled receivables, current	83		69
Excise Taxes [Abstract]
Excise Taxes Collected	45	39
Duke Energy Ohio [Member]
Unbilled Receivables [Abstract]
Unbilled receivables, current	1		55
Excise Taxes [Abstract]
Excise Taxes Collected	34	31
Duke Energy Ohio [Member] | CRC [Member]
Unbilled Receivables [Abstract]
Unbilled receivables, current	65		89
Duke Energy Indiana [Member]
Unbilled Receivables [Abstract]
Unbilled receivables, current	28		5
Excise Taxes [Abstract]
Excise Taxes Collected	10	9
Duke Energy Indiana [Member] | CRC [Member]
Unbilled Receivables [Abstract]
Unbilled receivables, current	$ 95		$ 144