Investments in Debt and Equity Securities (Tables)

6 Months Ended

Jun. 30, 2024

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Trading, and Equity Securities, FV-NI

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	June 30, 2024						December 31, 2023
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	151	$	—	$	—	$	133
Equity securities	5,612		23		7,859		4,942		22		7,278
Corporate debt securities	7		44		691		12		43		632
Municipal bonds	3		15		330		6		16		347
U.S. government bonds	6		79		1,668		24		65		1,575
Other debt securities	1		10		244		1		13		178
Total NDTF Investments	$	5,629	$	171	$	10,943	$	4,985	$	159	$	10,143
Other Investments
Cash and cash equivalents	$	—	$	—	$	124	$	—	$	—	$	31
Equity securities	51		—		177		33		—		158
Corporate debt securities	—		6		91		—		6		82
Municipal bonds	—		2		81		1		2		77
U.S. government bonds	—		4		50		—		2		65
Other debt securities	—		4		47		—		2		47
Total Other Investments	$	51	$	16	$	570	$	34	$	12	$	460
Total Investments	$	5,680	$	187	$	11,513	$	5,019	$	171	$	10,603

Debt Securities, Available-for-sale

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	June 30, 2024						December 31, 2023
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	151	$	—	$	—	$	133
Equity securities	5,612		23		7,859		4,942		22		7,278
Corporate debt securities	7		44		691		12		43		632
Municipal bonds	3		15		330		6		16		347
U.S. government bonds	6		79		1,668		24		65		1,575
Other debt securities	1		10		244		1		13		178
Total NDTF Investments	$	5,629	$	171	$	10,943	$	4,985	$	159	$	10,143
Other Investments
Cash and cash equivalents	$	—	$	—	$	124	$	—	$	—	$	31
Equity securities	51		—		177		33		—		158
Corporate debt securities	—		6		91		—		6		82
Municipal bonds	—		2		81		1		2		77
U.S. government bonds	—		4		50		—		2		65
Other debt securities	—		4		47		—		2		47
Total Other Investments	$	51	$	16	$	570	$	34	$	12	$	460
Total Investments	$	5,680	$	187	$	11,513	$	5,019	$	171	$	10,603

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and six months ended June 30, 2024, and 2023, were as follows.

	Three Months Ended				Six Months Ended
(in millions)	June 30, 2024		June 30, 2023		June 30, 2024		June 30, 2023
FV-NI:
Realized gains	$	127	$	20	$	195	$	46
Realized losses	27		36		45		82
AFS:
Realized gains	2		13		12		21
Realized losses	22		27		36		59

Investments Classified by Contractual Maturity Date

The table below summarizes the maturity date for debt securities.

	June 30, 2024
			Duke				Duke		Duke		Duke
	Duke		Energy		Progress		Energy		Energy		Energy
(in millions)	Energy		Carolinas		Energy		Progress		Florida		Indiana
Due in one year or less	$	115	$	11	$	81	$	18	$	63	$	8
Due after one through five years	785		297		403		289		114		21
Due after five through 10 years	664		411		209		197		12		9
Due after 10 years	1,638		865		679		639		40		24
Total	$	3,202	$	1,584	$	1,372	$	1,143	$	229	$	62

Duke Energy Carolinas

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Trading, and Equity Securities, FV-NI

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	June 30, 2024						December 31, 2023
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	57	$	—	$	—	$	51
Equity securities	3,254		16		4,527		2,886		14		4,196
Corporate debt securities	2		37		424		4		35		390
Municipal bonds	—		4		41		—		4		50
U.S. government bonds	2		44		894		13		33		826
Other debt securities	1		10		225		1		13		172
Total NDTF Investments	$	3,259	$	111	$	6,168	$	2,904	$	99	$	5,685

Debt Securities, Available-for-sale

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	June 30, 2024						December 31, 2023
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	57	$	—	$	—	$	51
Equity securities	3,254		16		4,527		2,886		14		4,196
Corporate debt securities	2		37		424		4		35		390
Municipal bonds	—		4		41		—		4		50
U.S. government bonds	2		44		894		13		33		826
Other debt securities	1		10		225		1		13		172
Total NDTF Investments	$	3,259	$	111	$	6,168	$	2,904	$	99	$	5,685

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and six months ended June 30, 2024, and 2023, were as follows.

	Three Months Ended				Six Months Ended
(in millions)	June 30, 2024		June 30, 2023		June 30, 2024		June 30, 2023
FV-NI:
Realized gains	$	72	$	9	$	125	$	27
Realized losses	15		18		21		47
AFS:
Realized gains	1		4		5		9
Realized losses	11		8		17		28

Progress Energy

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Trading, and Equity Securities, FV-NI

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	June 30, 2024						December 31, 2023
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	94	$	—	$	—	$	82
Equity securities	2,358		7		3,332		2,056		8		3,082
Corporate debt securities	5		7		267		8		8		242
Municipal bonds	3		11		289		6		12		297
U.S. government bonds	4		35		774		11		32		749
Other debt securities	—		—		19		—		—		6
Total NDTF Investments	$	2,370	$	60	$	4,775	$	2,081	$	60	$	4,458
Other Investments
Cash and cash equivalents	$	—	$	—	$	25	$	—	$	—	$	18
Municipal bonds	—		1		23		—		1		23
Total Other Investments	$	—	$	1	$	48	$	—	$	1	$	41
Total Investments	$	2,370	$	61	$	4,823	$	2,081	$	61	$	4,499

Debt Securities, Available-for-sale

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	June 30, 2024						December 31, 2023
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	94	$	—	$	—	$	82
Equity securities	2,358		7		3,332		2,056		8		3,082
Corporate debt securities	5		7		267		8		8		242
Municipal bonds	3		11		289		6		12		297
U.S. government bonds	4		35		774		11		32		749
Other debt securities	—		—		19		—		—		6
Total NDTF Investments	$	2,370	$	60	$	4,775	$	2,081	$	60	$	4,458
Other Investments
Cash and cash equivalents	$	—	$	—	$	25	$	—	$	—	$	18
Municipal bonds	—		1		23		—		1		23
Total Other Investments	$	—	$	1	$	48	$	—	$	1	$	41
Total Investments	$	2,370	$	61	$	4,823	$	2,081	$	61	$	4,499

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and six months ended June 30, 2024, and 2023, were as follows.

	Three Months Ended				Six Months Ended
(in millions)	June 30, 2024		June 30, 2023		June 30, 2024		June 30, 2023
FV-NI:
Realized gains	$	55	$	11	$	70	$	19
Realized losses	12		18		24		35
AFS:
Realized gains	1		9		7		12
Realized losses	11		19		19		31

Duke Energy Progress

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Trading, and Equity Securities, FV-NI

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	June 30, 2024						December 31, 2023
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	77	$	—	$	—	$	55
Equity securities	2,243		7		3,205		1,956		8		2,970
Corporate debt securities	4		7		254		7		8		229
Municipal bonds	3		11		289		6		12		297
U.S. government bonds	4		23		583		10		18		518
Other debt securities	—		—		17		—		—		6
Total NDTF Investments	$	2,254	$	48	$	4,425	$	1,979	$	46	$	4,075
Other Investments
Cash and cash equivalents	$	—	$	—	$	18	$	—	$	—	$	14
Total Other Investments	$	—	$	—	$	18	$	—	$	—	$	14
Total Investments	$	2,254	$	48	$	4,443	$	1,979	$	46	$	4,089

Debt Securities, Available-for-sale

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	June 30, 2024						December 31, 2023
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	77	$	—	$	—	$	55
Equity securities	2,243		7		3,205		1,956		8		2,970
Corporate debt securities	4		7		254		7		8		229
Municipal bonds	3		11		289		6		12		297
U.S. government bonds	4		23		583		10		18		518
Other debt securities	—		—		17		—		—		6
Total NDTF Investments	$	2,254	$	48	$	4,425	$	1,979	$	46	$	4,075
Other Investments
Cash and cash equivalents	$	—	$	—	$	18	$	—	$	—	$	14
Total Other Investments	$	—	$	—	$	18	$	—	$	—	$	14
Total Investments	$	2,254	$	48	$	4,443	$	1,979	$	46	$	4,089

Schedule of Realized Gain (Loss)

Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and six months ended June 30, 2024, and 2023, were as follows.

	Three Months Ended				Six Months Ended
(in millions)	June 30, 2024		June 30, 2023		June 30, 2024		June 30, 2023
FV-NI:
Realized gains	$	55	$	11	$	70	$	19
Realized losses	12		17		24		34
AFS:
Realized gains	1		8		7		11
Realized losses	10		17		18		29

Duke Energy Florida

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Trading, and Equity Securities, FV-NI

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	June 30, 2024						December 31, 2023
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	17	$	—	$	—	$	27
Equity securities	115		—		127		100		—		112
Corporate debt securities	1		—		13		1		—		13
U.S. government bonds	—		12		191		1		14		231
Other debt securities	—		—		2		—		—		—
Total NDTF Investments(a)	$	116	$	12	$	350	$	102	$	14	$	383
Other Investments
Cash and cash equivalents	$	—	$	—	$	3	$	—	$	—	$	3
Municipal bonds	—		1		23		—		1		23
Total Other Investments	$	—	$	1	$	26	$	—	$	1	$	26
Total Investments	$	116	$	13	$	376	$	102	$	15	$	409

(a)During the six months ended June 30, 2024, and the year ended December 31, 2023, Duke Energy Florida received reimbursements from the NDTF for costs related to ongoing decommissioning activity of Crystal River Unit 3.

Debt Securities, Available-for-sale

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.

	June 30, 2024						December 31, 2023
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
NDTF
Cash and cash equivalents	$	—	$	—	$	17	$	—	$	—	$	27
Equity securities	115		—		127		100		—		112
Corporate debt securities	1		—		13		1		—		13
U.S. government bonds	—		12		191		1		14		231
Other debt securities	—		—		2		—		—		—
Total NDTF Investments(a)	$	116	$	12	$	350	$	102	$	14	$	383
Other Investments
Cash and cash equivalents	$	—	$	—	$	3	$	—	$	—	$	3
Municipal bonds	—		1		23		—		1		23
Total Other Investments	$	—	$	1	$	26	$	—	$	1	$	26
Total Investments	$	116	$	13	$	376	$	102	$	15	$	409

(a)During the six months ended June 30, 2024, and the year ended December 31, 2023, Duke Energy Florida received reimbursements from the NDTF for costs related to ongoing decommissioning activity of Crystal River Unit 3.

Duke Energy Indiana

Debt Securities, Available-for-sale [Line Items]

Debt Securities, Trading, and Equity Securities, FV-NI

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are measured at FV-NI and debt investments are classified as AFS.

	June 30, 2024						December 31, 2023
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
Investments
Cash and cash equivalents	$	—	$	—	$	2	$	—	$	—	$	1
Equity securities	15		—		110		4		—		98
Corporate debt securities	—		—		7		—		—		8
Municipal bonds	—		1		47		1		1		46
U.S. government bonds	—		—		8		—		—		10
Total Investments	$	15	$	1	$	174	$	5	$	1	$	163

Debt Securities, Available-for-sale

The following table presents the estimated fair value of investments in debt and equity securities; equity investments are measured at FV-NI and debt investments are classified as AFS.

	June 30, 2024						December 31, 2023
	Gross		Gross				Gross		Gross
	Unrealized		Unrealized		Estimated		Unrealized		Unrealized		Estimated
	Holding		Holding		Fair		Holding		Holding		Fair
(in millions)	Gains		Losses		Value		Gains		Losses		Value
Investments
Cash and cash equivalents	$	—	$	—	$	2	$	—	$	—	$	1
Equity securities	15		—		110		4		—		98
Corporate debt securities	—		—		7		—		—		8
Municipal bonds	—		1		47		1		1		46
U.S. government bonds	—		—		8		—		—		10
Total Investments	$	15	$	1	$	174	$	5	$	1	$	163