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Investments in Debt and Equity Securities (Tables)

6 Months Ended

Jun. 30, 2013

Schedule of Investments [Line Items]

		June 30, 2013								December 31, 2012
(in millions)		Gross Unrealized Holding Gains			Gross Unrealized Holding Losses			Estimated Fair Value		Gross Unrealized Holding Gains			Gross Unrealized Holding Losses			Estimated Fair Value
NDTF
Cash and cash equivalents			$	―		$	―	$	91		$	―		$	―	$	105
Equity securities				1,418			27		3,170			1,132			19		2,837
Corporate debt securities				10			8		324			21			1		338
Municipal bonds				6			6		205			12			1		194
U.S. government bonds				12			13		625			24			1		625
Other debt securities				16			4		163			10			1		164
Total NDTF				1,462			58		4,578			1,199			23		4,263
Other Investments
Cash and cash equivalents				―			―		19			―			―		17
Equity securities				17			1		78			10			―		63
Corporate debt securities				1			2		334			2			―		381
Municipal bonds				3			2		77			4			1		70
U.S. government bonds				―			―		46			―			―		23
Other debt securities				―			2		96			1			―		86
Auction rate securities				―			7		26			―			6		29
Total Other Investments^(a)				21			14		676			17			7		669
Total Investments			$	1,483		$	72	$	5,254		$	1,216		$	30	$	4,932

(a)	These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.

Summarizes The Maturity Date For Debt Securities

(in millions)	June 30, 2013
Due in one year or less		$	340
Due after one through five years			392
Due after five through 10 years			366
Due after 10 years			772
Total		$	1,870

Schedule of realized gain (loss)


	Three Months Ended June 30,					Six Months Ended June 30,
(in millions)			2013	2012				2013	2012
Realized gains		$	32	$	29		$	63	$	50
Realized losses			15		―			22		2

Duke Energy Carolinas [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

		June 30, 2013								December 31, 2012
(in millions)		Gross Unrealized Holding Gains			Gross Unrealized Holding Losses			Estimated Fair Value		Gross Unrealized Holding Gains			Gross Unrealized Holding Losses			Estimated Fair Value
NDTF
Cash and cash equivalents			$	―		$	―	$	32		$	―		$	―	$	40
Equity securities				754			13		1,763			600			5		1,592
Corporate debt securities				5			6		234			11			1		250
Municipal bonds				―			1		42			2			―		40
U.S. government bonds				4			7		321			10			―		304
Other debt securities				15			4		141			9			2		135
Total NDTF				778			31		2,533			632			8		2,361
Other Investments
Auction rate securities				―			1		3			―			1		3
Total Other Investments^(a)				―			1		3			―			1		3
Total Investments			$	778		$	32	$	2,536		$	632		$	9	$	2,364

(a)	These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.

Summarizes The Maturity Date For Debt Securities

(in millions)	June 30, 2013
Due in one year or less		$	14
Due after one through five years			172
Due after five through 10 years			183
Due after 10 years			369
Total		$	738

Schedule of realized gain (loss)


	Three Months Ended June 30,					Six Months Ended June 30,
(in millions)			2013	2012				2013	2012
Realized gains		$	21	$	26		$	46	$	46
Realized losses			6		―			10		2

Progress Energy [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

		June 30, 2013								December 31, 2012
(in millions)		Gross Unrealized Holding Gains			Gross Unrealized Holding Losses			Estimated Fair Value		Gross Unrealized Holding Gains			Gross Unrealized Holding Losses			Estimated Fair Value
NDTF
Cash and cash equivalents			$	―		$	―	$	59		$	―		$	―	$	65
Equity securities				664			14		1,407			532			14		1,245
Corporate debt securities				5			2		90			9			―		89
Municipal bonds				6			5		163			11			1		154
U.S. government bonds				8			6		304			14			―		321
Other debt securities				1			―		22			1			―		28
Total NDTF				684			27		2,045			567			15		1,902
Other Investments
Cash and cash equivalents				―			―		19			―			―		17
Municipal bonds				3			1		40			3			―		40
Total Other Investments^(a)				3			1		59			3			―		57
Total Investments			$	687		$	28	$	2,104		$	570		$	15	$	1,959

(a)	These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.

Summarizes The Maturity Date For Debt Securities

(in millions)	June 30, 2013
Due in one year or less		$	20
Due after one through five years			150
Due after five through 10 years			139
Due after 10 years			310
Total		$	619

Schedule of realized gain (loss)


	Three Months Ended June 30,					Six Months Ended June 30,
(in millions)			2013	2012				2013	2012
Realized gains		$	10	$	8		$	15	$	15
Realized losses			7		1			9		―

Duke Energy Progress [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

		June 30, 2013								December 31, 2012
(in millions)		Gross Unrealized Holding Gains			Gross Unrealized Holding Losses			Estimated Fair Value		Gross Unrealized Holding Gains			Gross Unrealized Holding Losses			Estimated Fair Value
NDTF
Cash and cash equivalents			$	―		$	―	$	32		$	―		$	―	$	55
Equity securities				425			10		919			337			11		811
Corporate debt securities				4			2		80			8			―		78
Municipal bonds				3			4		102			4			―		80
U.S. government bonds				8			3		228			13			―		241
Other debt securities				1			―		11			1			―		10
Total NDTF				441			19		1,372			363			11		1,275
Other Investments
Cash and cash equivalents				―			―		2			―			―		3
Total Other Investments^(a)				―			―		2			―			―		3
Total Investments			$	441		$	19	$	1,374		$	363		$	11	$	1,278

(a)	These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.

Summarizes The Maturity Date For Debt Securities

(in millions)	June 30, 2013
Due in one year or less		$	12
Due after one through five years			132
Due after five through 10 years			76
Due after 10 years			201
Total		$	421

Schedule of realized gain (loss)


	Three Months Ended June 30,					Six Months Ended June 30,
(in millions)			2013	2012				2013	2012
Realized gains		$	6	$	5		$	8	$	10
Realized losses			3		1			4		3

Duke Energy Florida [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

		June 30, 2013								December 31, 2012
(in millions)		Gross Unrealized Holding Gains			Gross Unrealized Holding Losses			Estimated Fair Value		Gross Unrealized Holding Gains			Gross Unrealized Holding Losses			Estimated Fair Value
NDTF
Cash and cash equivalents			$	―		$	―	$	27		$	―		$	―	$	10
Equity securities				239			4		488			194			4		434
Corporate debt securities				1			―		10			1			―		11
Municipal bonds				3			1		61			7			―		74
U.S. government bonds				―			3		76			1			―		80
Other debt securities				―			―		11			1			―		18
Total NDTF				243			8		673			204			4		627
Other Investments
Cash and cash equivalents				―			―		3			―			―		1
Municipal bonds				3			―		40			3			―		40
Total Other Investments^(a)				3			―		43			3			―		41
Total Investments			$	246		$	8	$	716		$	207		$	4	$	668

(a)	These amounts are recorded in Other within Investments and Other Assets on the Condensed Balance sheets.

Summarizes The Maturity Date For Debt Securities

(in millions)	June 30, 2013
Due in one year or less		$	8
Due after one through five years			18
Due after five through 10 years			63
Due after 10 years			109
Total		$	198

Schedule of realized gain (loss)

	Three Months Ended June 30,					Six Months Ended June 30,
(in millions)			2013	2012				2013		2012
Realized gains		$	5	$	3		$	8	$	5
Realized losses			3		2			4		3

Duke Energy Indiana [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

		June 30, 2013								December 31, 2012
(in millions)		Gross Unrealized Holding Gains			Gross Unrealized Holding Losses			Estimated Fair Value		Gross Unrealized Holding Gains			Gross Unrealized Holding Losses			Estimated Fair Value
Other Investments
Equity securities			$	15		$	―	$	56		$	9		$	―	$	50
Municipal bonds				―			1		28			1			―		28
Total Other Investments^(a)				15			1		84			10			―	$	78
Total Investments			$	15		$	1	$	84		$	10		$	―	$	78

(a)	These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.

Summarizes The Maturity Date For Debt Securities

(in millions)	June 30, 2013
Due in one year or less		$	1
Due after one through five years			20
Due after five through 10 years			4
Due after 10 years			3
Total		$	28

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details