Commitments and Contingencies (Table)

9 Months Ended

Sep. 30, 2015

Valuation and Qualifying Accounts Disclosure [Line Items]

Schedule of Additional Possible Losses in Excess of Recorded Environmental Reserves

Additional losses in excess of recorded reserves that could be incurred for the stages of investigation, remediation and monitoring for environmental sites that have been evaluated at this time are presented in the table below.

(in millions)
Duke Energy	$	79
Duke Energy Carolinas	25
Progress Energy	4
Duke Energy Progress	1
Duke Energy Florida	3
Duke Energy Ohio	43
Duke Energy Indiana	7

Schedule of Loss Contingencies

The table below presents recorded reserves based on management’s best estimate of probable loss for legal matters, excluding asbestos-related reserves. Reserves are classified on the Condensed Consolidated Balance Sheets in Other within Deferred Credits and Other Liabilities and Accounts payable and Other within Current Liabilities. The reasonably possible range of loss in excess of recorded reserves is not material, other than as described above.

(in millions)	September 30, 2015		December 31, 2014
Reserves for Legal Matters
Duke Energy	$	178	$	323
Duke Energy Carolinas	12		72
Progress Energy	74		93
Duke Energy Progress	17		37
Duke Energy Florida	36		36
Duke Energy Ohio	81		—

Reserve for Environmental Costs [Member]

Valuation and Qualifying Accounts Disclosure [Line Items]

Schedule of Loss Contingencies

The following tables contain information regarding reserves for probable and estimable costs related to the various environmental sites. These reserves are recorded in Other within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheets.

	Nine Months Ended September 30, 2015
				Duke					Duke			Duke			Duke			Duke
	Duke			Energy		Progress			Energy			Energy			Energy			Energy
(in millions)	Energy			Carolinas		Energy			Progress			Florida			Ohio			Indiana
Balance at beginning of period	$	97		$	10	$	17		$	5		$	12		$	54		$	10
Provisions/adjustments	4			—		3			—			3			1			3
Cash reductions	(4		)	—		(2		)	(1		)	(1		)	(1		)	(1		)
Balance at end of period	$	97		$	10	$	18		$	4		$	14		$	54		$	12

	Nine Months Ended September 30, 2014
				Duke						Duke			Duke			Duke			Duke
	Duke			Energy			Progress			Energy			Energy			Energy			Energy
(in millions)	Energy			Carolinas			Energy			Progress			Florida			Ohio			Indiana
Balance at beginning of period	$	79		$	11		$	27		$	8		$	19		$	27		$	7
Provisions/adjustments	34			(1		)	4			3			1			28			3
Cash reductions	(8		)	—			(6		)	(4		)	(2		)	(1		)	(1		)
Balance at end of period	$	105		$	10		$	25		$	7		$	18		$	54		$	9