Goodwill (Tables)

9 Months Ended

Sep. 30, 2014

Goodwill [Line Items]

Goodwill By Reportable Operating Segment

The following tables present goodwill by reportable operating segment for Duke Energy and Duke Energy Ohio.

Duke Energy

(in millions)	Regulated Utilities		International Energy			Commercial Power			Total
Balance at December 31, 2013
Goodwill	$	15,950	$	326		$	935		$	17,211
Accumulated impairment charges	—		—			(871		)	(871		)
Balance at December 31, 2013, as adjusted for accumulated impairment charges	15,950		326			64			16,340
Foreign exchange and other changes	—		(9		)	—			(9		)
Balance at September 30, 2014
Goodwill	15,950		317			935			17,202
Accumulated impairment charges	—		—			(871		)	(871		)
Balance at September 30, 2014, as adjusted for accumulated impairment charges	$	15,950	$	317		$	64		$	16,331

Duke Energy Ohio [Member]

Goodwill [Line Items]

Goodwill By Reportable Operating Segment

Duke Energy Ohio

(in millions)	Regulated Utilities			Commercial Power			Total
Balance at December 31, 2013
Goodwill	$	1,136		$	1,188		$	2,324
Accumulated impairment charges	(216		)	(1,188		)	(1,404		)
Balance at December 31, 2013, as adjusted for accumulated impairment charges	920			—			920
Balance at September 30, 2014
Goodwill	1,136			1,188			2,324
Accumulated impairment charges	(216		)	(1,188		)	(1,404		)
Balance at September 30, 2014, as adjusted for accumulated impairment charges	$	920		$	—		$	920