Investments in Debt and Equity Securities (Tables)

12 Months Ended

Dec. 31, 2013

Schedule of Investments [Line Items]

Available-For-Sale Investments

DUKE ENERGY
The following table presents the estimated fair value of investments in available-for-sale securities.
		December 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		$	—	$	—	$	110	$	—	$	—	$	105
Equity securities			1,813		10		3,579		1,132		19		2,837
Corporate debt securities			8		6		400		21		1		338
Municipal bonds			2		6		160		12		1		194
U.S. government bonds			7		12		730		24		1		625
Other debt securities			22		2		154		10		1		164
Total NDTF			1,852		36		5,133		1,199		23		4,263
Other Investments
Cash and cash equivalents			—		—		21		—		—		17
Equity securities			29		—		91		10		—		63
Corporate debt securities			1		1		99		2		—		381
Municipal bonds			2		2		79		4		1		70
U.S. government bonds			—		—		17		—		—		23
Other debt securities			—		8		111		1		6		115
Total Other Investments(a)			32		11		418		17		7		669
Total Investments		$	1,884	$	47	$	5,551	$	1,216	$	30	$	4,932
(a)	These amounts are recorded in Other within Investments and Other Assets on the Consolidated Balance Sheets.

Schedule of Maturity Dates for Debt Securities

The table below summarizes the maturity date for debt securities.
(in millions)	December 31, 2013
Due in one year or less	$	89
Due after one through five years		431
Due after five through 10 years		426
Due after 10 years		804
Total	$	1,750

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of Duke Energy's available-for-sale securities were as follows.
	Years Ended December 31,
(in millions)	2013		2012		2011
Realized gains	$	209	$	117	$	79
Realized losses		65		19		37

Duke Energy Carolinas [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

DUKE ENERGY CAROLINAS
The following table presents the estimated fair value of investments in available-for-sale securities.
		December 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		$	―	$	―	$	42	$	―	$	―	$	40
Equity securities			974		6		1,964		600		5		1,592
Corporate debt securities			5		5		274		11		1		250
Municipal bonds			―		2		54		2		―		40
U.S. government bonds			3		7		354		10		―		304
Other debt securities			22		2		146		9		2		135
Total NDTF			1,004		22		2,834		632		8		2,361
Other Investments
Other debt securities			―		1		3		―		1		3
Total Other Investments(a)			―		1		3		―		1		3
Total Investments		$	1,004	$	23	$	2,837	$	632	$	9	$	2,364
(a)	These amounts are recorded in Other within Investments and Other Assets on the Consolidated Balance Sheets.

Schedule of Maturity Dates for Debt Securities

The table below summarizes the maturity date for debt securities.
(in millions)	December 31, 2013
Due in one year or less	$	18
Due after one through five years		167
Due after five through 10 years		239
Due after 10 years		407
Total	$	831

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of Duke Energy Carolinas' available-for-sale securities were as follows.
	Years Ended December 31,
(in millions)	2013		2012		2011
Realized gains	$	115	$	89	$	71
Realized losses		12		6		35

Progress Energy [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

PROGRESS ENERGY
The following table presents the estimated fair value of investments in available-for-sale securities for Progress Energy.
		December 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		$	―	$	―	$	68	$	―	$	―	$	65
Equity securities			839		4		1,615		532		14		1,245
Corporate debt securities			3		1		126		9		―		89
Municipal bonds			2		4		106		11		1		154
U.S. government bonds			4		5		376		14		―		321
Other debt securities			―		―		8		1		―		28
Total NDTF			848		14		2,299		567		15		1,902
Other Investments
Cash and cash equivalents			―		―		20		―		―		17
Municipal bonds			1		―		39		3		―		40
Total Other Investments(a)			1		―		59		3		―		57
Total Investments		$	849	$	14	$	2,358	$	570	$	15	$	1,959
(a)	These amounts are recorded in Other within Investments and Other Assets on the Consolidated Balance Sheets.

Schedule of Maturity Dates for Debt Securities

The table below summarizes the maturity date for debt securities.
(in millions)	December 31, 2013
Due in one year or less	$	12
Due after one through five years		206
Due after five through 10 years		131
Due after 10 years		306
Total	$	655

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of Progress Energy's available-for-sale securities were as follows.
	Years Ended December 31,
(in millions)	2013		2012		2011
Realized gains	$	90	$	34	$	30
Realized losses		46		18		33

Duke Energy Progress [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

DUKE ENERGY PROGRESS
The following table presents the estimated fair value of investments in available-for-sale securities.
		December 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		$	―	$	―	$	48	$	―	$	―	$	55
Equity securities			535		3		1,069		337		11		811
Corporate debt securities			3		1		80		8		―		78
Municipal bonds			2		4		104		4		―		80
U.S. government bonds			4		3		232		13		―		241
Other debt securities			―		―		5		1		―		10
Total NDTF			544		11		1,538		363		11		1,275
Other Investments
Cash and cash equivalents			―		―		2		―		―		3
Total Other Investments(a)			―		―		2		―		―		3
Total Investments		$	544	$	11	$	1,540	$	363	$	11	$	1,278
(a)	These amounts are recorded in Other within Investments and Other Assets on the Consolidated Balance Sheets.

Schedule of Maturity Dates for Debt Securities

The table below summarizes the maturity date for debt securities.
(in millions)	December 31, 2013
Due in one year or less	$	7
Due after one through five years		122
Due after five through 10 years		89
Due after 10 years		203
Total	$	421

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of Duke Energy Progress' available-for-sale securities were as follows.
	Years Ended December 31,
(in millions)	2013		2012		2011
Realized gains	$	58	$	21	$	13
Realized losses		26		8		16

Duke Energy Florida [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

DUKE ENERGY FLORIDA
The following table presents the estimated fair value of investments in available-for-sale securities.
		December 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		$	―	$	―	$	20	$	―	$	―	$	10
Equity securities			304		1		546		194		4		434
Corporate debt securities			―		―		46		1		―		11
Municipal bonds			―		―		2		7		―		74
U.S. government bonds			―		2		144		1		―		80
Other debt securities			―		―		3		1		―		18
Total NDTF			304		3		761		204		4		627
Other Investments
Cash and cash equivalents			―		―		3		―		―		1
Municipal bonds			1		―		39		3		―		40
Total Other Investments(a)			1		―		42		3		―		41
Total Investments		$	305	$	3	$	803	$	207	$	4	$	668
(a)	These amounts are recorded in Other within Investments and Other Assets on the Consolidated Balance sheets.

Schedule of Maturity Dates for Debt Securities

The table below summarizes the maturity date for debt securities.
(in millions)	December 31, 2013
Due in one year or less	$	5
Due after one through five years		84
Due after five through 10 years		42
Due after 10 years		103
Total	$	234

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of Duke Energy Florida's available-for-sale securities were as follows.
	Years Ended December 31,
(in millions)	2013		2012		2011
Realized gains	$	32	$	13	$	17
Realized losses		20		9		17

Duke Energy Indiana [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

DUKE ENERGY INDIANA
The following table presents the estimated fair value of investments in available-for-sale securities.
		December 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
Cash and cash equivalents		$	―	$	―	$	1	$	―	$	―	$	―
Equity securities			24		―		65		9		―		50
Municipal bonds			―		1		28		1		―		28
Total Other Investments(a)			24		1		94		10		―		78
Total Investments		$	24	$	1	$	94	$	10	$	―	$	78
(a)	These amounts are recorded in Other within Investments and Other Assets on the Consolidated Balance Sheets.

Schedule of Maturity Dates for Debt Securities

The table below summarizes the maturity date for debt securities held by Duke Energy Indiana.
(in millions)	December 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		2
Total	$	28