Goodwill (Goodwill By Reportable Operating Segment) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Goodwill [Line Items]
Goodwill	$ 17,211		$ 17,236
Acquisitions	(1)	[1]
Accumulated impairment charges	(871)		(871)
Foreign exchange and other changes	(24)
Goodwill as adjusted for accumulated impairment charges	16,340		16,365
Regulated Utilities [Member]
Goodwill [Line Items]
Goodwill	15,950		15,950
Acquisitions	2	[1]
Foreign exchange and other changes	(2)
Goodwill as adjusted for accumulated impairment charges	15,950		15,950
Commercial Power [Member]
Goodwill [Line Items]
Goodwill	935		933
Acquisitions	2	[1]
Accumulated impairment charges	(871)		(871)
Foreign exchange and other changes	0
Goodwill as adjusted for accumulated impairment charges	64		62
International [Member]
Goodwill [Line Items]
Goodwill	326		353
Acquisitions	(5)	[1]
Accumulated impairment charges	0		0
Foreign exchange and other changes	(22)
Goodwill as adjusted for accumulated impairment charges	326		353
Progress Energy [Member]
Goodwill [Line Items]
Goodwill	3,655		3,655
Goodwill as adjusted for accumulated impairment charges	3,655		3,655
Duke Energy Ohio [Member]
Goodwill [Line Items]
Goodwill	2,324		2,325
Accumulated impairment charges	1,404		(1,404)
Foreign exchange and other changes	(1)
Goodwill as adjusted for accumulated impairment charges	920		921
Duke Energy Ohio [Member] | Regulated Utilities [Member]
Goodwill [Line Items]
Goodwill	1,136		1,137
Accumulated impairment charges	216		(216)
Foreign exchange and other changes	(1)
Goodwill as adjusted for accumulated impairment charges	920		921
Duke Energy Ohio [Member] | DEO Commercial Power [Member]
Goodwill [Line Items]
Goodwill	1,188		1,188
Accumulated impairment charges	1,188		(1,188)
Goodwill as adjusted for accumulated impairment charges	$ 0		$ 0

[1] Amounts represent purchase price adjustments related to the Progress Energy merger at Regulated Utilities, the Chilean hydro acquisition at International Energy and a minor renewables acquisition at Commercial Power. See Note 2 for further information on purchase price adjustments related to the Progress Energy merger.