Goodwill (Goodwill By Reportable Operating Segment) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill	$ 17,213	$ 17,211
Accumulated impairment charges	(871)	(871)
Foreign exchange and other changes	2
Goodwill as adjusted for accumulated impairment charges	16,342	16,340
Regulated Utilities [Member]
Goodwill [Line Items]
Goodwill	15,950	15,950
Goodwill as adjusted for accumulated impairment charges	15,950	15,950
International [Member]
Goodwill [Line Items]
Goodwill	328	326
Foreign exchange and other changes	2
Goodwill as adjusted for accumulated impairment charges	328	326
Commercial Power [Member]
Goodwill [Line Items]
Goodwill	935	935
Accumulated impairment charges	(871)	(871)
Goodwill as adjusted for accumulated impairment charges	64	64
Progress Energy [Member]
Goodwill [Line Items]
Goodwill as adjusted for accumulated impairment charges	3,655	3,655
Duke Energy Ohio [Member]
Goodwill [Line Items]
Goodwill	2,324	2,324
Accumulated impairment charges	(1,404)	(1,404)
Goodwill as adjusted for accumulated impairment charges	920	920
Duke Energy Ohio [Member] | Regulated Utilities [Member]
Goodwill [Line Items]
Goodwill	1,136	1,136
Accumulated impairment charges	216	(216)
Goodwill as adjusted for accumulated impairment charges	920	920
Duke Energy Ohio [Member] | DEO Commercial Power [Member]
Goodwill [Line Items]
Goodwill	1,188	1,188
Accumulated impairment charges	$ (1,188)	$ (1,188)