Investments In Debt And Equity Securities (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of Investments [Line Items]

Available-For-Sale Investments

		March 31, 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			1,380		19		3,104		1,132		19		2,837
Corporate debt securities			17		2		333		21		1		338
Municipal bonds			10		1		189		12		1		194
U.S. government bonds			20		2		666		24		1		625
Other debt securities			12		2		163		10		1		164
Total NDTF		$	1,439	$	26	$	4,546	$	1,199	$	23	$	4,263
Other Investments
Cash and cash equivalents		$	―	$	―	$	21	$	―	$	―	$	17
Equity securities			16		―		84		10		―		63
Corporate debt securities			1		―		347		2		―		381
Municipal bonds			4		1		75		4		1		70
U.S. government bonds			―		―		73		―		―		23
Other debt securities			1		―		103		1		―		86
Auction rate securities			―		6		28		―		6		29
Total Other Investments(a)		$	22	$	7	$	731	$	17	$	7	$	669
Total Investments		$	1,461	$	33	$	5,277	$	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)	March 31, 2013
Due in one year or less	$	328
Due after one through five years		435
Due after five through 10 years		398
Due after 10 years		788
Total	$	1,949

Schedule of realized gain (loss)

	Three Months Ended March 31,
(in millions)	2013		2012
Realized gains	$	31	$	21
Realized losses		7		2

Duke Energy Carolinas [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

		March 31, 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		$	―	$	―	$	41	$	―	$	―	$	40
Equity securities			736		4		1,735		600		5		1,592
Corporate debt securities			9		2		239		11		1		250
Municipal bonds			―		―		21		2		―		40
U.S. government bonds			8		1		345		10		―		304
Other debt securities			11		2		136		9		2		135
Total NDTF		$	764	$	9	$	2,517	$	632	$	8	$	2,361
Other Investments
Auction rate securities		$	―	$	1	$	3	$	―	$	1	$	3
Total Other Investments(a)		$	―	$	1	$	3	$	―	$	1	$	3
Total Investments		$	764	$	10	$	2,520	$	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)	March 31, 2013
Due in one year or less	$	18
Due after one through five years		173
Due after five through 10 years		185
Due after 10 years		365
Total	$	741

Schedule of realized gain (loss)

	Three Months Ended March 31,
(in millions)	2013		2012
Realized gains	$	25	$	20
Realized losses		4		2

Progress Energy [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

		March 31, 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		$	―	$	―	$	50	$	―	$	―	$	65
Equity securities			644		15		1,369		532		14		1,245
Corporate debt securities			8		―		94		9		―		89
Municipal bonds			10		1		168		11		1		154
U.S. government bonds			12		1		321		14		―		321
Other debt securities			1		―		27		1		―		28
Total NDTF		$	675	$	17	$	2,029	$	567	$	15	$	1,902
Other Investments
Cash and cash equivalents		$	―	$	―	$	21	$	―	$	―	$	17
Municipal bonds			3		―		40		3		―		40
Total Other Investments(a)		$	3	$	―	$	61	$	3	$	―	$	57
Total Investments		$	678	$	17	$	2,090	$	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)	March 31, 2013
Due in one year or less	$	26
Due after one through five years		145
Due after five through 10 years		164
Due after 10 years		315
Total	$	650

Schedule of realized gain (loss)

	Three Months Ended March 31,
(in millions)	2013		2012
Realized gains	$	5	$	7
Realized losses		2		3

Duke Energy Progress [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

		March 31, 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		$	―	$	―	$	39	$	―	$	―	$	55
Equity securities			413		11		894		337		11		811
Corporate debt securities			6		―		84		8		―		78
Municipal bonds			4		―		95		4		―		80
U.S. government bonds			11		1		233		13		―		241
Other debt securities			1		―		11		1		―		10
Total NDTF		$	435	$	12	$	1,356	$	363	$	11	$	1,275
Other Investments
Cash and cash equivalents		$	―	$	―	$	4	$	―	$	―	$	3
Total Other Investments(a)		$	―	$	―	$	4	$	―	$	―	$	3
Total Investments		$	435	$	12	$	1,360	$	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)	March 31, 2013
Due in one year or less	$	11
Due after one through five years		128
Due after five through 10 years		76
Due after 10 years		208
Total	$	423

Schedule of realized gain (loss)

	Three Months Ended March 31,
(in millions)	2013		2012
Realized gains	$	2	$	5
Realized losses		1		2

Duke Energy Florida [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

		March 31, 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		$	―	$	―	$	11	$	―	$	―	$	10
Equity securities			231		4		475		194		4		434
Corporate debt securities			2		―		10		1		―		11
Municipal bonds			6		1		73		7		―		74
U.S. government bonds			1		―		88		1		―		80
Other debt securities			―		―		16		1		―		18
Total NDTF		$	240	$	5	$	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		$	243	$	5	$	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)	March 31, 2013
Due in one year or less	$	15
Due after one through five years		17
Due after five through 10 years		88
Due after 10 years		107
Total	$	227

Schedule of realized gain (loss)

	Three Months Ended March 31,
(in millions)	2013		2012
Realized gains	$	3	$	2
Realized losses		1		1

Duke Energy Indiana [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

		March 31, 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		$	14	$	―	$	54	$	9	$	―	$	50
Municipal bonds			1		―		29		1		―		28
Total Other Investments(a)		$	15	$	―	$	83	$	10	$	―	$	78
Total Investments		$	15	$	―	$	83	$	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)	March 31, 2013
Due in one year or less	$	1
Due after one through five years		21
Due after five through 10 years		4
Due after 10 years		3
Total	$	29