Commitments and Contingencies (Table)

6 Months Ended

Jun. 30, 2013

Jun. 30, 2012

Valuation and Qualifying Accounts Disclosure [Line Items]

Accrual For Environmental Loss Contingencies

Balance at December 31, 2012	$	75	$	12	$	33	$	14	$	19	$	15	$	8
Provisions / adjustments		4		―		4		1		3		(1)		1
Cash reductions		(12)		―		(3)		(1)		(2)		(6)		(2)
Balance at June 30, 2013	$	67	$	12	$	34	$	14	$	20	$	8	$	7

(in millions)	Duke Energy		Duke Energy Carolinas		Progress Energy		Duke Energy Progress		Duke Energy Florida		Duke Energy Ohio		Duke Energy Indiana
Balance at December 31, 2011	$	61	$	12	$	23	$	11	$	12	$	28	$	9
Provisions / adjustments		7		1		17		4		13		4		1
Cash reductions		(14)		―		(6)		(1)		(5)		(10)		(1)
Balance at June 30, 2012	$	54	$	13	$	34	$	14	$	20	$	22	$	9

Schedule of Additional Possible Losses in Excess of Recorded Environmental Reserves

(in millions)
Duke Energy	$	57
Duke Energy Carolinas		29
Progress Energy		6
Duke Energy Progress		3
Duke Energy Florida		3
Duke Energy Ohio		17
Duke Energy Indiana		5

Estimated Costs of Complying With Recently Issued and Proposed EPA Regulations

(in millions)	Range
Duke Energy	$	650	-	800
Duke Energy Carolinas		65	-	85
Progress Energy		7	-	30
Duke Energy Progress		5	-	10
Duke Energy Florida		2	-	20
Duke Energy Ohio		40	-	85
Duke Energy Indiana		540	-	600

Schedule of Litigation Reserves and Related Insurance Recoveries

(in millions)		June 30, 2013		December 31, 2012
Reserves for Legal and Other Matters(a)
Duke Energy(b)		$	871	$	846
Duke Energy Carolinas(b)			732		751
Progress Energy			73		79
Duke Energy Progress			10		12
Duke Energy Florida(c)			42		47
Duke Energy Indiana			8		8
Probable Insurance Recoveries(d)
Duke Energy(e)		$	781	$	781
Duke Energy Carolinas(e)			781		781
(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 asbestos-related injuries and damages claims.
(c)	Includes workers' compensation claims.
(d)	Insurance recoveries are classified in the respective Condensed Consolidated Balance Sheets in Other within Investments and Other Assets and Receivables.
(e)	Relates to recoveries associated with aforementioned asbestos-related injuries and damages claims.

Duke Energy Carolinas [Member]

Valuation and Qualifying Accounts Disclosure [Line Items]

Schedule of Litigation Reserves and Related Insurance Recoveries

(in millions)		June 30, 2013		December 31, 2012
Reserves for Legal and Other Matters(a)
Duke Energy(b)		$	871	$	846
Duke Energy Carolinas(b)			732		751
Progress Energy			73		79
Duke Energy Progress			10		12
Duke Energy Florida(c)			42		47
Duke Energy Indiana			8		8
Probable Insurance Recoveries(d)
Duke Energy(e)		$	781	$	781
Duke Energy Carolinas(e)			781		781
(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 asbestos-related injuries and damages claims.
(c)	Includes workers' compensation claims.
(d)	Insurance recoveries are classified in the respective Condensed Consolidated Balance Sheets in Other within Investments and Other Assets and Receivables.
(e)	Relates to recoveries associated with aforementioned asbestos-related injuries and damages claims.

Progress Energy [Member]

Valuation and Qualifying Accounts Disclosure [Line Items]

Schedule of Litigation Reserves and Related Insurance Recoveries

(in millions)		June 30, 2013		December 31, 2012
Reserves for Legal and Other Matters(a)
Duke Energy(b)		$	871	$	846
Duke Energy Carolinas(b)			732		751
Progress Energy			73		79
Duke Energy Progress			10		12
Duke Energy Florida(c)			42		47
Duke Energy Indiana			8		8
Probable Insurance Recoveries(d)
Duke Energy(e)		$	781	$	781
Duke Energy Carolinas(e)			781		781
(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 asbestos-related injuries and damages claims.
(c)	Includes workers' compensation claims.
(d)	Insurance recoveries are classified in the respective Condensed Consolidated Balance Sheets in Other within Investments and Other Assets and Receivables.
(e)	Relates to recoveries associated with aforementioned asbestos-related injuries and damages claims.

Duke Energy Progress [Member]

Valuation and Qualifying Accounts Disclosure [Line Items]

Schedule of Litigation Reserves and Related Insurance Recoveries

(in millions)		June 30, 2013		December 31, 2012
Reserves for Legal and Other Matters(a)
Duke Energy(b)		$	871	$	846
Duke Energy Carolinas(b)			732		751
Progress Energy			73		79
Duke Energy Progress			10		12
Duke Energy Florida(c)			42		47
Duke Energy Indiana			8		8
Probable Insurance Recoveries(d)
Duke Energy(e)		$	781	$	781
Duke Energy Carolinas(e)			781		781
(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 asbestos-related injuries and damages claims.
(c)	Includes workers' compensation claims.
(d)	Insurance recoveries are classified in the respective Condensed Consolidated Balance Sheets in Other within Investments and Other Assets and Receivables.
(e)	Relates to recoveries associated with aforementioned asbestos-related injuries and damages claims.

Duke Energy Florida [Member]

Valuation and Qualifying Accounts Disclosure [Line Items]

Schedule of Litigation Reserves and Related Insurance Recoveries

(in millions)		June 30, 2013		December 31, 2012
Reserves for Legal and Other Matters(a)
Duke Energy(b)		$	871	$	846
Duke Energy Carolinas(b)			732		751
Progress Energy			73		79
Duke Energy Progress			10		12
Duke Energy Florida(c)			42		47
Duke Energy Indiana			8		8
Probable Insurance Recoveries(d)
Duke Energy(e)		$	781	$	781
Duke Energy Carolinas(e)			781		781
(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 asbestos-related injuries and damages claims.
(c)	Includes workers' compensation claims.
(d)	Insurance recoveries are classified in the respective Condensed Consolidated Balance Sheets in Other within Investments and Other Assets and Receivables.
(e)	Relates to recoveries associated with aforementioned asbestos-related injuries and damages claims.

Duke Energy Indiana [Member]

Valuation and Qualifying Accounts Disclosure [Line Items]

Schedule of Litigation Reserves and Related Insurance Recoveries

(in millions)		June 30, 2013		December 31, 2012
Reserves for Legal and Other Matters(a)
Duke Energy(b)		$	871	$	846
Duke Energy Carolinas(b)			732		751
Progress Energy			73		79
Duke Energy Progress			10		12
Duke Energy Florida(c)			42		47
Duke Energy Indiana			8		8
Probable Insurance Recoveries(d)
Duke Energy(e)		$	781	$	781
Duke Energy Carolinas(e)			781		781
(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 asbestos-related injuries and damages claims.
(c)	Includes workers' compensation claims.
(d)	Insurance recoveries are classified in the respective Condensed Consolidated Balance Sheets in Other within Investments and Other Assets and Receivables.
(e)	Relates to recoveries associated with aforementioned asbestos-related injuries and damages claims.