Investments in Debt and Equity Securities (Tables)

3 Months Ended

Mar. 31, 2014

Schedule of Investments [Line Items]

Available-For-Sale Investments

		March 31, 2014								December 31, 2013
(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			$	―		$	―	$	114		$	―		$	―	$	110
Equity securities				1,854			14		3,623			1,813			10		3,579
Corporate debt securities				11			3		449			8			6		400
Municipal bonds				3			3		139			2			6		160
U.S. government bonds				10			7		708			7			12		730
Other debt securities				12			1		199			22			2		154
Total NDTF			$	1,890		$	28	$	5,232		$	1,852		$	36	$	5,133
Other Investments
Cash and cash equivalents				―			―		17			―			―		21
Equity securities				30			―		92			29			―		91
Corporate debt securities				1			―		72			1			1		99
Municipal bonds				3			1		79			2			2		79
U.S. government bonds				―			―		12			―			―		17
Other debt securities				―			7		107			―			8		111
Total Other Investments(a)			$	34		$	8	$	379		$	32		$	11	$	418
Total Investments			$	1,924		$	36	$	5,611		$	1,884		$	47	$	5,551
(a)	These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.

Schedule of Maturity Dates for Debt Securities

(in millions)	March 31, 2014
Due in one year or less		$	59
Due after one through five years			433
Due after five through 10 years			499
Due after 10 years			774
Total		$	1,765

Schedule of Realized Gain (Loss)

	Three Months Ended March 31,
(in millions)			2014	2013
Realized gains		$	31	$	31
Realized losses			4		7

Duke Energy Carolinas [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

		March 31, 2014								December 31, 2013
(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			$	―		$	―	$	70		$	―		$	―	$	42
Equity securities				1,001			8		1,982			974			6		1,964
Corporate debt securities				6			3		313			5			5		274
Municipal bonds				―			1		33			―			2		54
U.S. government bonds				4			4		309			3			7		354
Other debt securities				12			―		193			22			2		146
Total NDTF			$	1,023		$	16	$	2,900		$	1,004		$	22	$	2,834
Other Investments
Other debt securities				―			1		3			―			1		3
Total Other Investments(a)			$	―		$	1	$	3		$	―		$	1	$	3
Total Investments			$	1,023		$	17	$	2,903		$	1,004		$	23	$	2,837
(a)	These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.

Schedule of Maturity Dates for Debt Securities

(in millions)	March 31, 2014
Due in one year or less		$	24
Due after one through five years			165
Due after five through 10 years			305
Due after 10 years			357
Total		$	851

Schedule of Realized Gain (Loss)

	Three Months Ended March 31,
(in millions)			2014	2013
Realized gains		$	23	$	25
Realized losses			1		4

Progress Energy [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

		March 31, 2014								December 31, 2013
(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			$	―		$	―	$	44		$	―		$	―	$	68
Equity securities				853			6		1,641			839			4		1,615
Corporate debt securities				5			―		136			3			1		126
Municipal bonds				3			2		106			2			4		106
U.S. government bonds				6			3		399			4			5		376
Other debt securities				―			1		6			―			―		8
Total NDTF			$	867		$	12	$	2,332		$	848		$	14	$	2,299
Other Investments
Cash and cash equivalents				―			―		16			―			―		20
Municipal bonds				2			―		40			1			―		39
Total Other Investments(a)			$	2		$	―	$	56		$	1		$	―	$	59
Total Investments			$	869		$	12	$	2,388		$	849		$	14	$	2,358
(a)	These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.

Schedule of Maturity Dates for Debt Securities

(in millions)	March 31, 2014
Due in one year or less		$	16
Due after one through five years			212
Due after five through 10 years			136
Due after 10 years			323
Total		$	687

Schedule of Realized Gain (Loss)

	Three Months Ended March 31,
(in millions)			2014	2013
Realized gains		$	7	$	5
Realized losses			2		2

Duke Energy Progress [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

		March 31, 2014								December 31, 2013
(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			$	―		$	―	$	33		$	―		$	―	$	48
Equity securities				544			4		1,088			535			3		1,069
Corporate debt securities				4			―		87			3			1		80
Municipal bonds				3			2		104			2			4		104
U.S. government bonds				5			3		254			4			3		232
Other debt securities				―			1		3			―			―		5
Total NDTF			$	556		$	10	$	1,569		$	544		$	11	$	1,538
Other Investments
Cash and cash equivalents				―			―		―			―			―		2
Total Other Investments(a)			$	―		$	―	$	―		$	―		$	―	$	2
Total Investments			$	556		$	10	$	1,569		$	544		$	11	$	1,540
(a)	These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.

Schedule of Maturity Dates for Debt Securities

(in millions)	March 31, 2014
Due in one year or less		$	5
Due after one through five years			136
Due after five through 10 years			89
Due after 10 years			218
Total		$	448

Schedule of Realized Gain (Loss)

	Three Months Ended March 31,
(in millions)			2014	2013
Realized gains		$	6	$	2
Realized losses			2		1

Duke Energy Florida [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

		March 31, 2014								December 31, 2013
(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		$	―		$	―	$	20
Equity securities				309			2		553			304			1		546
Corporate debt securities				1			―		49			―			―		46
Municipal bonds				―			―		2			―			―		2
U.S. government bonds				1			―		145			―			2		144
Other debt securities				―			―		3			―			―		3
Total NDTF			$	311		$	2	$	763		$	304		$	3	$	761
Other Investments
Cash and cash equivalents				―			―		2			―			―		3
Municipal bonds				2			―		40			1			―		39
Total Other Investments(a)			$	2		$	―	$	42		$	1		$	―	$	42
Total Investments			$	313		$	2	$	805		$	305		$	3	$	803
(a)	These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.

Schedule of Maturity Dates for Debt Securities

(in millions)	March 31, 2014
Due in one year or less		$	11
Due after one through five years			76
Due after five through 10 years			47
Due after 10 years			105
Total		$	239

Schedule of Realized Gain (Loss)

	Three Months Ended March 31,
(in millions)			2014		2013
Realized gains		$	1	$	3
Realized losses			1		1

Duke Energy Indiana [Member]

Schedule of Investments [Line Items]

Available-For-Sale Investments

		March 31, 2014								December 31, 2013
(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		$	―		$	―	$	1
Equity securities				25			―		66			24			―		65
Municipal bonds				―			1		28			―			1		28
Total Other Investments(a)			$	25		$	1	$	95		$	24		$	1	$	94
Total Investments			$	25		$	1	$	95		$	24		$	1	$	94
(a)	These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.

Schedule of Maturity Dates for Debt Securities

(in millions)	March 31, 2014
Due in one year or less		$	1
Due after one through five years			20
Due after five through 10 years			5
Due after 10 years			2
Total		$	28