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Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Goodwill [Roll Forward]
Foreign exchange and other changes		$ (17)
Goodwill, Acquired During Period		24
Goodwill as adjusted for accumulated impairment charges		16,328		$ 16,321
Asset impairment charges	$ (16)		$ 80
Regulated Utilities [Member]
Goodwill [Roll Forward]
Goodwill as adjusted for accumulated impairment charges		15,950		15,950
International [Member]
Goodwill [Roll Forward]
Foreign exchange and other changes		(17)
Goodwill as adjusted for accumulated impairment charges		290		307
Commercial Portfolio [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period		24
Goodwill as adjusted for accumulated impairment charges		88		64
Goodwill, Disposal Group				871
Goodwill, Impaired, Accumulated Impairment Loss				(871)
Commercial Portfolio [Member] \| Other VIEs [Member]
Goodwill [Roll Forward]
Asset impairment charges			94
Duke Energy Ohio [Member]
Goodwill [Roll Forward]
Goodwill		920		1,188
Goodwill as adjusted for accumulated impairment charges		920		920
Goodwill, Impaired, Accumulated Impairment Loss		$ 216		1,188
Asset impairment charges			94
Duke Energy Ohio [Member] \| Other VIEs [Member]
Goodwill [Roll Forward]
Asset impairment charges			94	$ 94
Duke Energy Ohio [Member] \| Commercial Portfolio [Member] \| Other VIEs [Member]
Goodwill [Roll Forward]
Asset impairment charges			$ 94