Commitments and Contingencies (Table)

9 Months Ended

Sep. 30, 2012

Commitments And Contingencies [Abstract]

Schedule of Litigation Reserves and Related Insurance Recoveries [Table Text Block]

(in millions)		September 30, 2012		December 31, 2011
Reserves for Legal Matters(a)
Duke Energy(b)		$	975	$	810
Duke Energy Carolinas(b)			763		801
Duke Energy Indiana			7		4
Probable Insurance Recoveries(c)
Duke Energy(d)		$	781	$	813
Duke Energy Carolinas(d)			781		813
(a)	Reserves are classified in the respective Condensed Consolidated Balance Sheets in Other within Deferred Credits and Other Liabilities and Other within Current Liabilities.
(b)	Includes reserves for aforementioned asbestos-related injuries and damages claims.
(c)	Insurance recoveries are classified in the respective Condensed Consolidated Balance Sheets in Other within Investments and Other Assets and Receivables.
(d)	Relates to recoveries associated with aforementioned asbestos-related injuries and damages claims.

Accrual For Environmental Loss Contingencies [Table Text Block]

(in millions)		Balance at December 31, 2011		Provisions / Adjustments(b)		Cash Reductions		Balance at September 30, 2012
Duke Energy(a)		$	61	$	43	$	(19)	$	85
Duke Energy Carolinas			12		1		―		13
Duke Energy Ohio(a)			28		10		(15)		23
Duke Energy Indiana			9		2		(2)		9
(in millions)		Balance at December 31, 2010		Provisions / Adjustments		Cash Reductions		Balance at September 30, 2011
Duke Energy(a)		$	88	$	5	$	(21)	$	72
Duke Energy Carolinas			13		―		―		13
Duke Energy Ohio(a)			50		3		(17)		36
Duke Energy Indiana			11		1		(2)		10
(a)	Environmental reserves relate primarily to former Manufactured Gas Plants (MGP) and Other Sites.
(b)	Amounts at Duke Energy include $32 million in environmental reserves assumed during the Progress Energy merger.