Investments in Debt and Equity Securities Investments in Debt and Equity Securities (Tables)

6 Months Ended

Jun. 30, 2014

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities

The following table presents the estimated fair value of investments in available-for-sale securities.

	June 30, 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	$	—	$	—	$	110
Equity securities	2,007		14		3,873		1,813		10		3,579
Corporate debt securities	17		2		492		8		6		400
Municipal bonds	5		1		144		2		6		160
U.S. government bonds	14		3		700		7		12		730
Other debt securities	1		1		142		22		2		154
Total NDTF	$	2,044	$	21	$	5,421	$	1,852	$	36	$	5,133
Other Investments
Cash and cash equivalents	$	—	$	—	$	17	$	—	$	—	$	21
Equity securities	34		—		97		29		—		91
Corporate debt securities	2		—		66		1		1		99
Municipal bonds	4		1		82		2		2		79
U.S. government bonds	—		—		13		—		—		17
Other debt securities	1		6		110		—		8		111
Total Other Investments(a)	$	41	$	7	$	385	$	32	$	11	$	418
Total Investments	$	2,085	$	28	$	5,806	$	1,884	$	47	$	5,551

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

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.

(in millions)	June 30, 2014
Due in one year or less	$	57
Due after one through five years	459
Due after five through 10 years	440
Due after 10 years	793
Total	$	1,749

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.

	Three Months Ended June 30,				Six Months Ended June 30,
(in millions)	2014		2013		2014		2013
Realized gains	$	31	$	32	$	62	$	63
Realized losses	2		15		6		22

Duke Energy Carolinas [Member]

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities

The following table presents the estimated fair value of investments in available-for-sale securities.

	June 30, 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	$	—	$	—	$	42
Equity securities	1,085		8		2,156		974		6		1,964
Corporate debt securities	10		2		343		5		5		274
Municipal bonds	1		—		36		—		2		54
U.S. government bonds	5		1		306		3		7		354
Other debt securities	—		1		125		22		2		146
Total NDTF	$	1,101	$	12	$	2,999	$	1,004	$	22	$	2,834
Other Investments
Other debt securities	$	—	$	1	$	3	$	—	$	1	$	3
Total Other Investments(a)	$	—	$	1	$	3	$	—	$	1	$	3
Total Investments	$	1,101	$	13	$	3,002	$	1,004	$	23	$	2,837

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

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.

(in millions)	June 30, 2014
Due in one year or less	$	24
Due after one through five years	182
Due after five through 10 years	243
Due after 10 years	364
Total	$	813

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.

	Three Months Ended June 30,				Six Months Ended June 30,
(in millions)	2014		2013		2014		2013
Realized gains	$	29	$	21	$	52	$	46
Realized losses	1		6		2		10

Progress Energy [Member]

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities

The following table presents the estimated fair value investments in available-for-sale securities.

	June 30, 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	$	—	$	—	$	37	$	—	$	—	$	68
Equity securities	922		6		1,717		839		4		1,615
Corporate debt securities	7		—		149		3		1		126
Municipal bonds	4		1		108		2		4		106
U.S. government bonds	9		2		394		4		5		376
Other debt securities	1		—		17		—		—		8
Total NDTF	$	943	$	9	$	2,422	$	848	$	14	$	2,299
Other Investments
Cash and cash equivalents	$	—	$	—	$	17	$	—	$	—	$	20
Municipal bonds	3		—		41		1		—		39
Total Other Investments(a)	$	3	$	—	$	58	$	1	$	—	$	59
Total Investments	$	946	$	9	$	2,480	$	849	$	14	$	2,358

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

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.

(in millions)	June 30, 2014
Due in one year or less	$	24
Due after one through five years	217
Due after five through 10 years	141
Due after 10 years	327
Total	$	709

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.

	Three Months Ended June 30,				Six Months Ended June 30,
(in millions)	2014		2013		2014		2013
Realized gains	$	2	$	10	$	9	$	15
Realized losses	1		7		3		9

Duke Energy Progress [Member]

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities

The following table presents the estimated fair value of investments in available-for-sale securities.

	June 30, 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	$	—	$	—	$	27	$	—	$	—	$	48
Equity securities	590		4		1,139		535		3		1,069
Corporate debt securities	5		—		94		3		1		80
Municipal bonds	4		1		106		2		4		104
U.S. government bonds	7		2		256		4		3		232
Other debt securities	1		—		10		—		—		5
Total NDTF	$	607	$	7	$	1,632	$	544	$	11	$	1,538
Other Investments
Cash and cash equivalents	$	—	$	—	$	2	$	—	$	—	$	2
Total Other Investments(a)	$	—	$	—	$	2	$	—	$	—	$	2
Total Investments	$	607	$	7	$	1,634	$	544	$	11	$	1,540

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

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.

(in millions)	June 30, 2014
Due in one year or less	$	15
Due after one through five years	141
Due after five through 10 years	90
Due after 10 years	220
Total	$	466

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.

	Three Months Ended June 30,				Six Months Ended June 30,
(in millions)	2014		2013		2014		2013
Realized gains	$	1	$	6	$	7	$	8
Realized losses	—		3		2		4

Duke Energy Florida [Member]

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities

The following table presents the estimated fair value of investments in available-for-sale securities.

	June 30, 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	$	—	$	—	$	10	$	—	$	—	$	20
Equity securities	332		2		578		304		1		546
Corporate debt securities	2		—		55		—		—		46
Municipal bonds	—		—		2		—		—		2
U.S. government bonds	2		—		138		—		2		144
Other debt securities	—		—		7		—		—		3
Total NDTF	$	336	$	2	$	790	$	304	$	3	$	761
Other Investments
Cash and cash equivalents	$	—	$	—	$	2	$	—	$	—	$	3
Municipal bonds	3		—		41		1		—		39
Total Other Investments(a)	$	3	$	—	$	43	$	1	$	—	$	42
Total Investments	$	339	$	2	$	833	$	305	$	3	$	803

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

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.

(in millions)	June 30, 2014
Due in one year or less	$	9
Due after one through five years	76
Due after five through 10 years	51
Due after 10 years	107
Total	$	243

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.

	Three Months Ended June 30,				Six Months Ended June 30,
(in millions)	2014		2013		2014		2013
Realized gains	$	1	$	5	$	2	$	8
Realized losses	—		3		1		4

Duke Energy Indiana [Member]

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities

The following table presents the estimated fair value of investments in available-for-sale securities.

	June 30, 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	27		—		69		24		—		65
Municipal bonds	—		1		30		—		1		28
Total Other Investments(a)	$	27	$	1	$	100	$	24	$	1	$	94
Total Investments	$	27	$	1	$	100	$	24	$	1	$	94

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

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.

(in millions)	June 30, 2014
Due in one year or less	$	1
Due after one through five years	19
Due after five through 10 years	7
Due after 10 years	3
Total	$	30