Goodwill, Intangible Assets And Impairments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Pre-tax impairment charge	$ 0	$ 402
Goodwill, Gross	17,242		17,236
Commercial Power [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Gross	935		933
Progress Energy [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Gross	3,655		3,655
Duke Energy Ohio [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Gross	2,325		2,325
Duke Energy Indiana [Member]
Finite-Lived Intangible Assets [Line Items]
Pre-tax impairment charge	$ 0	$ 400